Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Bedienungsanleitung PDF herunterladen (Seite 147)

7 DETAILS OF INSTRUCTIONS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

139

pops %sd

Function

Pop

Standard) When

sd = ahr: alr ← W[sp], sp ← sp + 4, ahr ← W[sp], sp ← sp + 4

When

sd = alr: alr ← W[sp], sp ← sp + 4

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

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

s d

0x00D_

Flag

IE C V Z N

– – – – –

Mode

CLK

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

Description

This instruction restores the data of special registers that have been saved to the stack by a pushs

instruction back to each register.

(1) When the

sd register is the ALR register

The word data at the address indicated by the current SP is restored to the ALR register, and the

SP is incremented by an amount equivalent to 1 word (4 bytes).

(2) When the

sd register is the AHR register

The word data at the address indicated by the current SP is restored to the ALR register, and

the SP is incremented by an amount equivalent to 1 word (4 bytes). Next, the word data at the

address indicated by the current SP is restored to the AHR register, and the SP is incremented

by an amount equivalent to 1 word (4 bytes). The

sd must be the same register as specified in

the corresponding pushs instruction.

Stack operation when pops %sd (where %sd = %ahr) is executed

31 0

alr ← Data 0

ahr ← Data 1

31 0

Data 1

Data 0

Data 1

Data 0

Example

(1) pops %alr ; alr is restored singly

(2) pops %ahr ; registers are restored in order of alr and ahr

Caution

When a register other than ALR or AHR is specified as the sd register, the pops instruction does

not pop data from the stack.

1 2 ... 142 143 144 145 146 147 148 149 150 151 152 ... 180 181

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