7702 datasheet(47/217 Pages) RENESAS

47 / 217 page

CENTRAL PROCESSING UNIT (CPU)

7702/7703 Group User’s Manual

2–21

2.5 Processor modes

The M37702 can operate in 3 processor modes: single-chip mode, memory expansion mode, and microprocessor

mode. Some pins’ functions, memory assignment, and access space vary according to the processor modes.

This section describes the differences between the processor modes. Figure 2.5.1 shows a memory assignment

in each processor mode.

2.5 Processor modes

00000016

00FFFF16

00008016

SFR area

Internal

ROM area

Single-chip mode

Internal

RAM area

SFR area

Memory expansion mode

01000016

FFFFFF16

SFR area

Microprocessor mode

Not used

Internal

RAM area

Internal

RAM area

Internal

ROM area

00000216

00000916

(Note 1)

: External area; Accessing this area make it possible to access external connected devices.

Notes 1: Addresses 216 to 916 become a external area in the memory expansion mode and microprocessor mode.

2: Refer to “Appendix 1. Memory assignment” for products other than M37702M2BXXXFP.

00027F16

00C00016

00028016

00BFFF16

Memory expansion mode

Microprocessor mode

Fig. 2.5.1 Memory assignment in each processor mode for M37702M2BXXXFP

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