GMS81C50 Datasheet, PDF(95/99 Page) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCONTROLLERS

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GMS81C50 Datasheet, PDF (95/99 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCONTROLLERS

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Appendix A. GMS800 Series Instruction

6. Control Operation & etc.

NO.

MNENONIC

1 BRK

2 DI

3 EI

4 NOP

5 POP A

6 POP X

7 POP Y

8 POP PSW

9 PUSH A

10 PUSH X

11 PUSH Y

12 PUSH PSW

13 RET

14 RETI

15 STOP

CODE

BYTE

NO.

CYCLE

OPERATION

Software interrupt:

B â â1â, M(SP) â (PCH), SP â SP - 1,

M(s) â (PCL), SP â S - 1, M(SP) â PSW,

SP â SP - 1, PCL â (0FFDEH), PCH â (0FFDFH)

Disable interrupts : I â â0â

Enable interrupts : I â â1â

No operation

Pop from stack

SP â SP + 1, Reg. â M(SP)

Push to stack

M(SP) â Reg. SP â SP - 1

Return from subroutine :

SP â SP+1, PCL â M(SP), SP â SP+1, PCH â M(SP)

Return from interrupt :

SP â SP+1, PSW â M(SP), SP â SP+1,PCL â M(SP),

SP â SP+1, PCH â M(SP)

Stop mode (halt CPU, stop oscillator)

FLAG

NVGBHIZC

---1-0--

-----0--

-----1--

--------

(restored)

--------

(restored)

--------

A-12

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