Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Uživatelský manuál stáhnout pdf (Strana 151)

7 DETAILS OF INSTRUCTIONS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

143

pushn %rs

Function

Push

Standard) “sp

← sp - 4, W[sp] ← rN” repeated for rN = rs to r0

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

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

r s

0x020_

Flag

IE C V Z N

– – – – –

Mode

CLK

N + 1 cycles, where N = number of registers to be saved

Description

Save the data of general-purpose registers to the stack.

The pushn instruction first decrements the current SP by an amount equivalent to 1 word (4 bytes),

and saves the content of the rs register to that address. This operation is repeated successively until

the r0 register is reached.

Stack operation when pushn %rs (where %rs = %r3) is executed

31 0

r3 data

r2 data

r1 data

r0 data

Example

pushn %r3 ; r3, r2, r1, and r0 are saved

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Uživatelský manuál Strana 151