7733 datasheet(41/940 Pages) RENESAS

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CENTRAL PROCESSING UNIT (CPU)

7733 Group User’s Manual

2–2

2.1 Central processing unit

The CPU of the 7733 Group has ten registers as shown in Figure 2.1.1. Each of these registers is described

below.

Fig. 2.1.1 CPU registers structure

b15

b23

b16 b15

PCH

PCL

b15

b10

000

IPL

Accumulator A (A)

Accumulator B (B)

Index register X (X)

Index register Y (Y)

Stack pointer (S)

Data bank register (DT)

Program counter (PC)

Program bank register (PG)

Direct page register (DPR)

Processor status register (PS)

Processor interrupt priority level

Carry flag

Zero flag

Interrupt disable flag

Index register length flag

Decimal mode flag

Data length flag

Overflow flag

Negative flag

DPRL

DPRH

PSL

PSH

b15

2.1 Central processing unit

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