UPD17072 View Datasheet(PDF) - NEC => Renesas Technology

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Description

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UPD17072

4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM

NEC => Renesas Technology 

µPD17072,17073

5.4 Program Status Word (PSWORD)

5.4.1 Configuration of program status word

Figure 5-4 shows the configuration of the program status word.

As shown in this figure, the program status word consists of a total of 5 bits: the least significant bit of address

7EH (RPL) and 4 bits of 7FH (PSW) of the system register. However, bit 0 of 7FH is always fixed to 0.

Each of the 5 bits in the program status word has its own function as a BCD flag (BCD), compare flag (CMP), carry

flag (CY), zero flag (Z), respectively.

Figure 5-4. Program Status Word Configuration

Address

Name

Symbol

Bit

Data

7EH

7FH

(RP)

RPL

Program status

word (PSWORD)

PSW

b0 b2 b2 b0 b0 b2 b2 b0

BCC Z

CM Y

DP

0

Power-ON

0

0

Clock stop

0

0

CE

0

0

36

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