Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Instrukcja Użytkownika Pobierz pdf (Strona 22)

3 DATA FORMATS

EPSON

S1C33 FAMILY C33 PE CORE MANUAL

3.3 Unsigned 8-Bit Transfer (Memory → Register)

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

[%rb]

Byte

7 0

00000000

31 24 23 16 15 8

Byte

7 0

%rd

00000000

Figure 3.3.1 Unsigned 8-Bit Transfer (Memory → Register)

Bits 31–8 in the destination register are zero-extended.

3.4 Signed 8-Bit Transfer (Memory → Register)

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

[%rb]

7 0

SSSSSSSS

31 24 23 16 15 8

Byte

7 0

%rd

SSSSSSSS

Byte

Figure 3.4.1 Signed 8-Bit Transfer (Memory → Register)

Bits 31–8 in the destination register are sign-extended.

3.5 8-Bit Transfer (Register → Memory)

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

X%rs

31 24

23 16

15 8

Byte

7 0

Byte

7 0

[%rb]

Figure 3.5.1 8-Bit Transfer (Register → Memory)

3.6 Unsigned 16-Bit Transfer (Register → Register)

Example: ld.uh %rd,%rs

X%rs

31 16 15

Halfword

00000000

31 16 15

Halfword

%rd 00000000

Figure 3.6.1 Unsigned 16-Bit Transfer (Register → Register)

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

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 180 181

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