Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 152)

7 DETAILS OF INSTRUCTIONS

144

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

pushs %ss

Function

Push

Standard) When

ss = ahr: sp ← sp - 4, W[sp] ← ahr, sp ← sp - 4, W[sp] ← alr

When

ss = alr: sp ← sp - 4, W[sp] ← alr

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

0 0 0 0 0 0 0 0 1 0 0 1

s s

0x009_

Flag

IE C V Z N

– – – – –

Mode

CLK

Two cycles (when ss = alr), Three cycles (when ss = ahr)

Description

Save the data of special registers to the stack.

(1) When the

ss register is the ALR register

The current SP is decremented by an amount equivalent to 1 word (4 bytes), and the content of

the ALR register is saved to that address.

(2) When the

ss register is the AHR register

The current SP is decremented by an amount equivalent to 1 word (4 bytes), and the content of

the AHR register is saved to that address. Next, SP is decremented by an amount equivalent to 1

word (4 bytes), and the content of the ALR register is saved to that address.

Stack operation when pushs %ss (where %ss = %ahr) is executed

31 0

The ahr and alr registers are saved

31 0

ahr data

alr data

Example

(1) pushs %alr ; alr is saved singly

(2) pushs %ahr ; registers are saved in order of ahr and alr

Caution

When a register other than ALR or AHR is specified as the ss register, the pushs instruction does

not save the register data to the stack.

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario Pagina 152

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