Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 128)

7 DETAILS OF INSTRUCTIONS

120

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

ld.w %rd, [%rb]

Function

Word data transfer

Standard) rd

← W[rb]

Extension 1) rd

← W[rb + imm13]

Extension 2) rd

← W[rb + imm26]

Code

15 12 11 8 7 4 3 0

0 0 1 1 0 0 0 0

r b r d

0x30__

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.w

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

The word data in the specified memory location is transferred to the rd register. The

rb register

contains the memory address to be accessed.

(2) Extension 1

ext

imm13

ld.w

%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 word 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.w

%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

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

rb register is not altered.

Caution

The rb register and the displacement must specify a word boundary address (two least significant

bits = 0). Specifying other addresses causes an address misaligned exception.

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 180 181

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