Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Instrukcja Użytkownika Pobierz pdf (Strona 146)

7 DETAILS OF INSTRUCTIONS

138

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

popn %rd

Function

Pop

Standard) “

rN ← W[sp], sp ← sp + 4” repeated for rN = r0 to rd

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

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

r d

0x024_

Flag

IE C V Z N

– – – – –

Mode

CLK

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

Description

The data of general-purpose registers that have been saved to the stack by a pushn instruction is

restored from the stack. The

popn instruction restores word data from the stack with its address

indicated by the current SP to the r0 register, and increments the SP by an amount equivalent to 1

word (4 bytes). This operation is repeated until a register that matches rd is reached. The rd must be

the same register as specified in the corresponding pushn instruction.

Stack operation when popn %rd (where %rd = %r3) is executed

31 0

r0 ← Data 0

r1 ← Data 1

r2 ← Data 2

r3 ← Data 3

31 0

Data 3

Data 2

Data 1

Data 0

Data 3

Data 2

Data 1

Data 0

Example

popn %r3 ; r0, r1, r2, and r3 are restored

1 2 ... 141 142 143 144 145 146 147 148 149 150 151 ... 180 181

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