Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 117)

7 DETAILS OF INSTRUCTIONS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

109

ld.h [%sp + imm6], %rs

Function

Signed halfword data transfer

Standard) H[sp +

imm6 × 2] ← rs(15:0)

Extension 1) H[sp +

imm19] ← rs(15:0)

Extension 2) H[sp +

imm32] ← rs(15:0)

Code

15 12 11 10 9 4 3 0

0 1 0 1 1 0

imm6 r s

0x58__

Flag

IE C V Z N

– – – – –

Mode

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

Dst: Register indirect with displacement

CLK

Two cycles

Description

(1) Standard

ld.h [%sp +

imm6],%rs ; memory address = sp + imm6 × 2

The 16 low-order bits of the rs register are transferred to the specified memory location. The

content of the current SP with twice the 6-bit immediate imm6 added as displacement comprises

the memory address to be accessed. The least significant bit of the displacement is always 0.

(2) Extension 1

ext

imm13 ; = imm19(18:6)

ld.h [%sp +

imm6],%rs ; memory address = sp + imm19,

;

imm6 = imm19(5:0)

The ext instruction extends the displacement to a 19-bit quantity. As a result, the 16 low-

order bits of the rs register are transferred to the address indicated by the content of the SP with

the 19-bit immediate

imm19 added. Make sure the imm6 specified here resides on a halfword

boundary (least significant bit = 0).

(3) Extension 2

ext

imm13 ; = imm32(31:19)

ext

imm13 ; = imm32(18:6)

ld.h [%sp +

imm6],%rs ; memory address = sp + imm32,

;

imm6 = imm32(5:0)

The two

ext instructions extend the displacement to a 32-bit quantity. As a result, the 16 low-

order bits of the rs register are transferred to the address indicated by the content of the SP with

the 32-bit immediate

imm32 added. Make sure the imm6 specified here resides on a halfword

boundary (least significant bit = 0).

Example

ext 0x1

ld.h [%sp + 0x2],%r0 ; H[sp + 0x42]

← 16 low-order bits of r0

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario Pagina 117

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