UPD784031Y 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD784031Y

16-/8-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD784031Y

6.2 CPU Registers

6.2.1 General-purpose registers

Sixteen 8-bit general-purpose registers are available. Two 8-bit registers can be also used in pairs as a 16-bit register.

Of the 16-bit registers, four can be used in combination with an 8-bit register for address expansion as 24-bit address

specification registers.

Eight banks of these registers are available which can be selected by using software or the context switching function.

The general-purpose registers except V, U, T, and W registers for address expansion are mapped to the internal RAM.

Figure 6-2. General-purpose Register Format

A (R1)

X (R0)

AX (RP0)

B (R3)

C (R2)

BC (RP1)

R5

R4

RP2

R7

R6

RP3

V

R9

R8

VVP (RG4)

VP (RP4)

U

R11

R10

UUP (RG5)

UP (RP5)

T

D (R13)

E (R12)

TDE (RG6)

DE (RP6)

W

H (R15)

L (R14)

WHL (RG7)

HL (RP7)

Parentheses ( ) indicate an absolute name.

8 banks

Caution

Registers R4, R5, R6, R7, RP2, and RP3 can be used as X, A, C, B, AX, and BC registers, respectively,

by setting the RSS bit of the PSW to 1. However, use this function only for recycling the program of

the 78K/III Series.

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