HD404019RFS datasheet(13/65 Pages) RENESAS

No. de pieza	HD404019RFS

Descripción Electrónicos	CMOS 4-bit single-chip microcomputers

PDF	65 Pages

Scroll/Zoom	100%

Fabricante Electrónico	RENESAS [Renesas Technology Corp]

Página de inicio	http://www.renesas.com

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13 / 65 page

HD404019R Series

Functional Description

Registers and Flags

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

Carry flag

Status flag

Program counter

Stack pointer

SPY

SPY register

SPX

SPX register

Y register

X register

B register

Accumulator

W register

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.

HD404019RFS Datasheet(PDF) 13 Page - Renesas Technology Corp