Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Instrukcja Użytkownika Pobierz pdf (Strona 114)

7 DETAILS OF INSTRUCTIONS

106

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

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

Function

Signed halfword data transfer

Standard) rd(15:0)

← H[sp + imm6 × 2], rd(31:16) ← H[sp + imm6 × 2](15)

Extension 1) rd(15:0)

← H[sp + imm19], rd(31:16) ← H[sp + imm19](15)

Extension 2) rd(15:0)

← H[sp + imm32], rd(31:16) ← H[sp + imm32](15)

Code

15 12 11 10 9 4 3 0

0 1 0 0 1 0

imm6 r d

0x48__

Flag

IE C V Z N

– – – – –

Mode

Src: Register indirect with displacement

Dst: Register direct

%rd = %r0 to %r15

CLK

Two cycles

Description

(1) Standard

ld.h

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

The halfword data in the specified memory location is transferred to the rd register after being

sign-extended to 32 bits. 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

%rd,[%sp + imm6] ; memory address = sp + imm19,

;

imm6 = imm19(5:0)

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

SP with the 19-bit immediate imm19 added comprises the memory address, the halfword data in

which is transferred to the rd register. 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

%rd,[%sp + imm6] ; memory address = sp + imm32,

;

imm6 = imm32(5:0)

The two

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

of the SP with the 32-bit immediate

imm32 added comprises the memory address, the halfword

data in which is transferred to the rd register. Make sure the

imm6 specified here resides on a

halfword boundary (least significant bit = 0).

Example

ext 0x1

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

← [sp + 0x42] sign-extended

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 180 181

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