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UPD784936A

16-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD784935A,784936A,784937A,784938A

7.2 CPU Registers

7.2.1 General-purpose registers

Sixteen 8-bit general-purpose registers are available. Two 8-bit general-purpose registers can be used in com-

bination as a 16-bit general-purpose register. Four of the 16-bit registers can be used in combination with an 8-bit

register for address extension as 24-bit address specification registers.

Eight banks of register sets are available, which can be selected by software or using the context switching function.

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

RAM.

Figure 7-5. 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)

( ): Absolute name

8 banks

Caution 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 PSW to 1. However, use this function only when using a program written

for the 78K/III series.

Data Sheet U13572EJ2V0DS

27

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