UPD784225YGK-XXX-9EU View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD784225YGK-XXX-9EU

16/8-BIT SINGLE-CHIP MICROCONTROLLERS

NEC => Renesas Technology 

µPD784224, 784225, 784224Y, 784225Y

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 6-3. 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.

Data Sheet U12376EJ1V0DS00

23

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