UPD784036 データシートの表示（PDF） - NEC => Renesas Technology

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UPD784036

16/8-BIT SINGLE-CHIP MICROCONTROLLER

NEC => Renesas Technology 

µPD784035(A), 784036(A)

6.2 CPU Registers

6.2.1 General-purpose registers

A set of general-purpose registers consists of sixteen general-purpose 8-bit registers. Two 8-bit general-purpose

registers can be combined to form a 16-bit general-purpose register. Moreover, four 16-bit general-purpose registers,

when combined with an 8-bit register for address extension, can be used as 24-bit address specification registers.

Eight banks of this register set are provided. The user can switch between banks by software or the context

switching function.

General-purpose registers other than the V, U, T, and W registers used for address extension are mapped onto

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)

The character strings enclosed in

parentheses represent absolute names.

8 banks

Caution By setting the RSS bit of PSW to 1, R4, R5, R6, R7, RP2, and RP3 can be used as the X, A, C, B,

AX, and BC registers, respectively. However, this function must be used only when using

programs for the 78K/III series.

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