UPD75236GJ データシートの表示（PDF） - NEC => Renesas Technology

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UPD75236GJ

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75236

3.7 PROGRAM STATUS WORD (PSW): 8 BITS

The program status word (PSW) consists of various types of flags closely related to processor operation.

The PSW is mapped at addresses FB0H and FB1H in the data memory space and 4 bits at address FB0H can

be operated by the memory manipulation instruction. Normal data memory manipulation instructions cannot

be used at address FB1H.

Fig. 3-11 Program Status Word Configuration

Save

Restore

Address

FB1H

FB0H

CY SK2 SK1 SK0 IST1 IST0 MBE RBE

Non-Manipulatable

Manipulatable by a

Dedicated Instruction

Manipulatable

Symbol

PSW

Table 3-2 PSW Flag to be Saved/Restored in Stack Operation

During CALL/CALLF instruction execution

Upon hardware interruption

During RET/RETS instruction execution

During RETI instruction execution

Flag to be Saved/Restored

MBE and RBE saved

All PSW bits saved

MBE and RBE restored

All PSW bits restored

36

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