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PDF PIC16F648A Data sheet ( Hoja de datos )
| Número de pieza | PIC16F648A | |
| Descripción | 8-Bit CMOS Microcontrollers with nanoWatt Technology | |
| Fabricantes | Microchip Technology | |
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PIC16F627A/628A/648A
Data Sheet
Flash-Based, 8-Bit CMOS
Microcontrollers with nanoWatt Technology
© 2009 Microchip Technology Inc.
DS40044G
1 page  
PIC16F627A/628A/648A
Table of Contents
1.0 General Description ........................................................................................................................................................................ 7
2.0 PIC16F627A/628A/648A Device Varieties...................................................................................................................................... 9
3.0 Architectural Overview .................................................................................................................................................................. 11
4.0 Memory Organization .................................................................................................................................................................... 17
5.0 I/O Ports ........................................................................................................................................................................................ 33
6.0 Timer0 Module .............................................................................................................................................................................. 47
7.0 Timer1 Module .............................................................................................................................................................................. 50
8.0 Timer2 Module .............................................................................................................................................................................. 54
9.0 Capture/Compare/PWM (CCP) Module ........................................................................................................................................ 57
10.0 Comparator Module .................................................................................................................................................................... 63
11.0 Voltage Reference Module ......................................................................................................................................................... 69
12.0 Universal Synchronous Asynchronous Receiver Transmitter (USART) Module......................................................................... 73
13.0 Data EEPROM Memory .............................................................................................................................................................. 91
14.0 Special Features of the CPU ...................................................................................................................................................... 97
15.0 Instruction Set Summary........................................................................................................................................................... 117
16.0 Development Support ............................................................................................................................................................... 131
17.0 Electrical Specifications ............................................................................................................................................................ 135
18.0 DC and AC Characteristics Graphs and Tables ....................................................................................................................... 151
19.0 Packaging Information .............................................................................................................................................................. 163
Appendix A: Data Sheet Revision History......................................................................................................................................... 171
Appendix B: Device Differences ....................................................................................................................................................... 171
Appendix C: Device Migrations ......................................................................................................................................................... 172
Appendix D: Migrating from other PIC® Devices .............................................................................................................................. 172
The Microchip Web Site .................................................................................................................................................................... 173
Customer Change Notification Service ............................................................................................................................................. 173
Customer Support ............................................................................................................................................................................. 173
Reader Response ............................................................................................................................................................................. 174
Product Identification System ........................................................................................................................................................... 179
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Micro-
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and enhanced as new volumes and updates are introduced.
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welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000A is version A of document DS30000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision
of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
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When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
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© 2009 Microchip Technology Inc.
DS40044G-page 5
5 Page 
PIC16F627A/628A/648A
3.0 ARCHITECTURAL OVERVIEW
The high performance of the PIC16F627A/628A/648A
family can be attributed to a number of architectural
features commonly found in RISC microprocessors. To
begin with, the PIC16F627A/628A/648A uses a
Harvard architecture in which program and data are
accessed from separate memories using separate
busses. This improves bandwidth over traditional Von
Neumann architecture where program and data are
fetched from the same memory. Separating program
and data memory further allows instructions to be sized
differently than 8-bit wide data word. Instruction
opcodes are 14-bits wide making it possible to have all
single-word instructions. A 14-bit wide program mem-
ory access bus fetches a 14-bit instruction in a single
cycle. A two-stage pipeline overlaps fetch and execu-
tion of instructions. Consequently, all instructions (35)
execute in a single-cycle (200 ns @ 20 MHz) except for
program branches.
Table 3-1 lists device memory sizes (Flash, Data and
EEPROM).
TABLE 3-1:
Device
PIC16F627A
PIC16F628A
PIC16F648A
PIC16LF627A
PIC16LF628A
PIC16LF648A
DEVICE MEMORY LIST
Memory
Flash
Program
1024 x 14
2048 x 14
4096 x 14
1024 x 14
2048 x 14
4096 x 14
RAM
Data
224 x 8
224 x 8
256 x 8
224 x 8
224 x 8
256 x 8
EEPROM
Data
128 x 8
128 x 8
256 x 8
128 x 8
128 x 8
256 x 8
The PIC16F627A/628A/648A can directly or indirectly
address its register files or data memory. All Special
Function Registers (SFR), including the program
counter, are mapped in the data memory. The
PIC16F627A/628A/648A have an orthogonal (symmet-
rical) instruction set that makes it possible to carry out
any operation, on any register, using any addressing
mode. This symmetrical nature and lack of ‘special
optimal situations’ makes programming with the
PIC16F627A/628A/648A simple yet efficient. In
addition, the learning curve is reduced significantly.
The PIC16F627A/628A/648A devices contain an 8-bit
ALU and working register. The ALU is a general
purpose arithmetic unit. It performs arithmetic and
Boolean functions between data in the working register
and any register file.
The ALU is 8-bits wide and capable of addition,
subtraction, shift and logical operations. Unless
otherwise mentioned, arithmetic operations are two’s
complement in nature. In two-operand instructions,
typically one operand is the working register
(W register). The other operand is a file register or an
immediate constant. In single operand instructions, the
operand is either the W register or a file register.
The W register is an 8-bit working register used for ALU
operations. It is not an addressable register.
Depending on the instruction executed, the ALU may
affect the values of the Carry (C), Digit Carry (DC), and
Zero (Z) bits in the Status Register. The C and DC bits
operate as Borrow and Digit Borrow out bits,
respectively, in subtraction. See the SUBLW and SUBWF
instructions for examples.
A simplified block diagram is shown in Figure 3-1, and
a description of the device pins in Table 3-2.
Two types of data memory are provided on the
PIC16F627A/628A/648A devices. Nonvolatile
EEPROM data memory is provided for long term
storage of data, such as calibration values, look-up
table data, and any other data which may require
periodic updating in the field. These data types are not
lost when power is removed. The other data memory
provided is regular RAM data memory. Regular RAM
data memory is provided for temporary storage of data
during normal operation. Data is lost when power is
removed.
© 2009 Microchip Technology Inc.
DS40044G-page 11
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