HD4074019H データシートの表示（PDF） - Renesas Electronics

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HD4074019H

(HD404054 / HD404094) HMCS400-series microcomputers designed to increase program productivity

Renesas Electronics 

Functional Description

HD404019R Series

Registers and Flags

The MCU has nine registers and two flags for the CPU operations (figure 5).

3

0

A

Accumulator

3

0

B

B register

10

W W register

3

0

X

X register

3

0

Y

Y register

3

0

SPX

SPX register

3

0

SPY

SPY register

0

CA Carry flag

0

ST Status flag

13

PC

0

Program counter

9

5

11 1 1

SP

0

Stack pointer

Figure 5 Registers and Flags

Accumulator (A), B Register (B): The 4-bit accumulator and B register hold the results from the

arithmetic logic unit (ALU), and transfer data to/from memory, I/O, and other registers.

W Register (W), X Register (X), Y Register (Y): The 2-bit W register, and the 4-bit X and Y registers

indirectly address RAM. The Y register is also used for D-port addressing.

SPX Register (SPX), SPY Register (SPY): The 4-bit registers SPX and SPY assist the X and Y registers,

respectively.

Carry Flag (CA): The carry flag (CA) stores the overflow from the ALU generated by an arithmetic

operation. It is also affected by the SEC, REC, ROTL, and ROTR instructions.

11

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