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Número de pieza | UPD6125ACA | |
Descripción | 4-BIT SINGLE CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION | |
Fabricantes | NEC | |
Logotipo | ||
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MOS INTEGRATED CIRCUIT
µPD6125A, 6126A
4-BIT SINGLE CHIP MICROCONTROLLER
FOR REMOTE CONTROL TRANSMISSION
DESCRIPTION
The µPD6125A and 6126A are 4-bit single-chip microcontrollers for infrared remote controllers for TVs, VCRs,
stereos, cassette decks, air conditioners, etc.
These microcontrollers consist of ROM, RAM, a 4-bit parallel-processing ALU, a programmable timer, key input/
output ports, and transmit output ports. Functioning is controlled in software.
FEATURES
• Transmitter for programmable infrared remote
controller
• 19 types of instructions
• Instruction execution time: 17.6 µs (with 455-kHz
ceramic oscillator)
• Program memory (ROM) capacity: 1002 × 10 bits
• Data memory (RAM) capacity: 32 × 5 bits
• 9-bit programmable timer: 1 channel
• I/O pins (KI/O): 8 pins
• I/O pins (I/O)
• µPD6125A: 4 pins
• µPD6126A: 8 pins
• Input pins (KI): 4 pins
• Serial input pins (S-IN): 1 pin
• Transmission-in-progress indication pin (S-OUT):
1 pin
• Transmit carrier frequency (REM)
fOSC/12, fOSC/8
• Standby operation (HALT/STOP mode)
• Low power consumption
• Current consumption in STOP mode (TA = 25°C)
1 µA MAX.
• Low-voltage operation: VDD = 2.0 to 6.0 V
Caution To use the NEC transmission format, ask NEC to supply the custom code.
The mask option (PLA data) setting of µPD6125A, µPD6126A is different from that of the µPD6125,
6126.
When a register is used as the operand of a branch instruction, do not use R0.
The information in this document is subject to change without notice.
Document No. U12392EJ4V0DS00 (4th edition)
(Previous No. IC-2014B)
Date Published May 1997 N
Printed in Japan
The mark shows major revised points.
©
1989
1 page µPD6125A, 6126A
3. PROGRAM MEMORY (ROM) ……… 1002 STEPS × 10 BITS
The program memory (ROM) is configured in 10 bits steps. It is addressed by the program counter.
Program and table data are stored in the program memory.
Figure 3-1. Program Memory Map
000H
0FFH
100H
1FFH
200H
2FFH
300H
3E9H
3EAH
3FFH
4. DATA MEMORY (RAM) ……… 32 WORDS × 5 BITS
Test program
area
The data memory is a RAM of 32 words × 5 bits. The data memory stores processing data. In some cases, the
data memory is processed in 8-bit units. R0 may be used as the data pointer for the ROM.
After power application, the RAM will be undefined. The RAM retains the previous data on reset.
Figure 4-1. Data Memory Organization
10
R0
to
RB
RC
SP-3
to SP-2
SP-1
R F SP-0
Caution
Avoid using the RAM areas RD, RE, and RF in a CALL routine as much as possible because these
areas are also used as stack memory areas (to prevent program hang-up in case the value of
the SP is destroyed due to some reason such as noise).
When using these RAM areas as general-purpose RAM areas, be sure to include stack pointer
checking in the main routine.
5
5 Page µPD6125A, 6126A
11.5 KI Pin (P12)
This is the 4-bit pin for key input. All of these pins can be pulled down to the VSS level by mask option.
Figure 11-3. KI Pin Organization
P12
P2 KI3
KI2 KI1 KI0
Mask option
11.6 KI Pull-Down Resistor Organization
Pin
KI pull-down
resistor switch
(Mask option)
Pull-down
resistor
V SS
V DD
P-ch
N-ch
V SS
Input signal
When the pull-down resistor switch is turned on (set 1) by the mask option, pull-down resistor R is turned on.
Caution When using the pin as the key switch, turn on the pull-down resistor switch by the mask option.
11
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet UPD6125ACA.PDF ] |
Número de pieza | Descripción | Fabricantes |
UPD6125ACA | 4-BIT SINGLE CHIP MICROCONTROLLER FOR REMOTE CONTROL TRANSMISSION | NEC |
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