UPD62A NEC, UPD62A Datasheet - Page 43

• Manufacturer Part Number: UPD62A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

9.8 Subroutine Instructions
performs page optimization, it is unnecessary to designate pages. The pages allowed for each product are as
follows.
The program memory consists of pages in steps of 1K (000H to 3FFH). However, as the assembler automatically
CALL addr
RET
PD62A (ROM: 0.5 K steps):
PD6P4B (PROM: 1 K steps): page 0
<1> Instruction code:
<2> Cycle count:
<3> Function:
<1> Instruction code:
<2> Cycle count:
<3> Function:
The stack pointer value is incremented (+1) and the program counter value is saved in the address stack
register. Then, the address specified with the operand addr (a
If a carry is generated when the stack pointer value is incremented (+1), an internal reset takes effect.
The value saved in the address stack register is restored to the program counter. Then, the stack
pointer is decremented (–1) .
If a borrow is generated when the stack pointer value is decremented (–1), an internal reset takes effect.
page 0
2
SP
ASR
PC
1
PC
SP
a
0 0 1 1 0 1 0 0 1 0
0 1 0 0 0 1 0 0 1 0
9
a
7
page 0
a
6
SP + 1
addr
ASR
SP – 1
a
5
PC
a
0 1 0 0 0 1 0 0 0 1
4
a
8
Data Sheet U14474EJ1V0DS00
a
3
a
2
a
1
a
0
; page 1
9
to a
0 1 0 0 1 1 0 0 0 1
0
) is entered in the program counter.
PD62A
43