UPD62AMC datasheet(43/62 Pages) NEC

tên linh kiện	UPD62AMC

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µPD62A

Data Sheet U14474EJ1V0DS00

9.8 Subroutine Instructions

The program memory consists of pages in steps of 1K (000H to 3FFH). However, as the assembler automatically

performs page optimization, it is unnecessary to designate pages. The pages allowed for each product are as

follows.

µPD62A (ROM: 0.5 K steps):

page 0

µPD6P4B (PROM: 1 K steps): page 0

CALL addr

<1> Instruction code:

0 01101001 0

page 0

0100010001

; page 1 0100110001

a9 a7 a6 a5 a4 a8 a3 a2 a1 a0

<2> Cycle count:

<3> Function:

← SP + 1

ASR

← PC

← addr

The stack pointer value is incremented (+1) and the program counter value is saved in the address stack

If a carry is generated when the stack pointer value is incremented (+1), an internal reset takes effect.

RET

<1> Instruction code:

0 10001001 0

<2> Cycle count:

<3> Function:

← ASR

← SP – 1

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.

UPD62AMC bảng dữ liệu(PDF) 43 Page - NEC