Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual do Utilizador descarregar pdf (Página 119)

7 DETAILS OF INSTRUCTIONS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

111

ld.ub %rd, [%rb]

Function

Unsigned byte data transfer

Standard) rd(7:0)

← B[rb], rd(31:8) ← 0

Extension 1) rd(7:0)

← B[rb + imm13], rd(31:8) ← 0

Extension 2) rd(7:0)

← B[rb + imm26], rd(31:8) ← 0

Code

15 12 11 8 7 4 3 0

0 0 1 0 0 1 0 0

r b r d

0x24__

Flag

IE C V Z N

– – – – –

Mode

Src: Register indirect %rb = %r0 to %r15

Dst: Register direct

%rd = %r0 to %r15

CLK

One cycle (two cycles when ext is used)

Description

(1) Standard

ld.ub

%rd,[%rb] ; memory address = rb

The byte data in the specified memory location is transferred to the rd register after being zero-

extended to 32 bits. The

rb register contains the memory address to be accessed.

(2) Extension 1

ext

imm13

ld.ub

%rd,[%rb] ; memory address = rb + imm13

The ext instruction changes the addressing mode to register indirect addressing with

displacement. As a result, the content of the

rb register with the 13-bit immediate imm13 added

comprises the memory address, the byte data in which is transferred to the rd register. The

content of the rb register is not altered.

(3) Extension 2

ext

imm13 ; = imm26(25:13)

ext

imm13 ; = imm26(12:0)

ld.ub

%rd,[%rb] ; memory address = rb + imm26

The addressing mode changes to register indirect addressing with displacement, so the content

of the

rb register with the 26-bit immediate imm26 added comprises the memory address, the

byte data in which is transferred to the rd register. The content of the

rb register is not altered.

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 180 181

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