Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual do Utilizador descarregar pdf (Página 101)

7 DETAILS OF INSTRUCTIONS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

ld.b %rd, %rs

Function

Signed byte data transfer

Standard) rd(7:0)

← rs(7:0), rd(31:8) ← rs(7)

Extension 1) Unusable

Extension 2) Unusable

Code

15 12 11 8 7 4 3 0

1 0 1 0 0 0 0 1

r s r d

0xA1__

Flag

IE C V Z N

– – – – –

Mode

Src: Register direct %rs = %r0 to %r15

Dst: Register direct

%rd = %r0 to %r15

CLK

One cycle

Description

(1) Standard

The 8 low-order bits of the rs register are transferred to the rd register after being sign-extended

to 32 bits.

(2) Delayed instruction

This instruction may be executed as a delayed instruction by writing it directly after a branch

instruction with the “d” bit.

Example

ld.b %r0,%r1 ; r0 ← r1(7:0) sign-extended

1 2 ... 96 97 98 99 100 101 102 103 104 105 106 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual do Utilizador Página 101