Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manuel d'utilisateur télécharger pdf (Page 23)

3 DATA FORMATS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

3.7 Signed 16-Bit Transfer (Register → Register)

Example: ld.h %rd,%rs

X%rs

31 16 15 0

SSSSSSSS

31 16

Halfword

%rd

SSSSSSSS

Halfword

Figure 3.7.1 Signed 16-Bit Transfer (Register → Register)

Bits 31–16 in the destination register are sign-extended.

3.8 Unsigned 16-Bit Transfer (Memory → Register)

Example: ld.uh %rd,[%rb]

[%rb] 0x∗∗∗∗∗∗∗0

Byte 0

00000000

31 16 15

Byte 0

Byte 1

0x∗∗∗∗∗∗∗1

Byte 1

%rd 00000000

Figure 3.8.1 Unsigned 16-Bit Transfer (Memory → Register)

Bits 31–16 in the destination register are zero-extended.

3.9 Signed 16-Bit Transfer (Memory → Register)

Example: ld.h %rd,[%rb]

[%rb] 0x∗∗∗∗∗∗∗0

Byte 0

31 16 15

Byte 0

Byte 1

0x∗∗∗∗∗∗∗1

Byte 1

%rd

SSSSSSSS SSSSSSSS

Figure 3.9.1 Signed 16-Bit Transfer (Memory → Register)

Bits 31–16 in the destination register are sign-extended.

3.10 16-Bit Transfer (Register → Memory)

Example: ld.h [%rb],%rs

X%rs

31 16

[%rb] 0x∗∗∗∗∗∗∗0

Byte 0

7 0

7815

Byte 0

Byte 1

0x∗∗∗∗∗∗∗1

Byte 1

Figure 3.10.1 16-Bit Transfer (Register → Memory)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 180 181

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Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manuel d'utilisateur Page 23

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