UPD70433GJ-16-3EB Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD70433GJ-16-3EB

V55PI™ 16-BIT MICROPROCESSOR

NEC => Renesas Technology 

µPD70433

3.2.2 General Registers (AW, BW, CW, DW)

There are four 16-bit general registers. In addition to being accessed as 16-bit registers, these registers can also be

accessed as 8-bit registers by dividing each register into upper and lower 8-bit halves (AH, AL, BH, BL, CH, CL, DH, DL).

These registers are used as 8-bit or 16-bit registers with a wide range of instructions including transfer, arithmetic and

logical operation instructions.

Each register is also used as the default register for specific instruction processing, as shown below.

AW : Word multiplication/division, word input/output, data conversion

AL : Byte multiplication/division, byte input/output, BCD rotation, data conversion

AH : Byte multiplication/division

BW : Data conversion

CW : Loop control branch, repeat prefix

CL : Shift instructions, rotate instructions, BCD operations

DW : Word multiplication/division, indirect addressing input/output

These registers are mapped onto the register file space (in on-chip RAM). The address is the value obtained by adding

the offset for each register to (register bank number × 32).

Table 3-1. General Register Offsets

Register

AW

BW

CW

DW

Offset

1EH

18H

1CH

1AH

Register

AL

AH

BL

BH

CL

CH

DL

DH

Offset

1EH

1FH

18H

19H

1CH

1DH

1AH

1BH

19

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