D17133CS datasheet(76/289 Pages) NEC

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D17133CS датащи(PDF) 76 Page - NEC

номер детали	D17133CS

подробное описание детали	4-BIT SINGLE-CHIP MICROCONTROLLER

PDF	289 Pages

Scroll/Zoom	100%

производитель	NEC [NEC]

домашняя страница	http://www.nec.com/

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CHAPTER 7

SYSTEM REGISTER (SYSREG)

7.7 PROGRAM STATUS WORD (PSWORD)

7.7.1 Program Status Word Configuration

Figure 7-16 shows the configuration of the program status word.

Figure 7-16. Program Status Word Configuration

7EH

Address

Name

Bit

Symbol

Initial value when reset

RPL

7FH

Program status

word (PSWORD)

PSW

Data

(RP)

As shown in Figure 7-16, the program status word consists of five bits; the least significant bit of system register

address 7EH (RPL) and all four bits of system register address 7FH (PSW).

The program status word is divided into the following 1-bit flags: Binary coded decimal flag (BCD), compare flag

(CMP), carry flag (CY), zero flag (Z), and the index enable flag (IXE).

All register bits are cleared to 0 at reset and at saved at interrupt stack register.

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