7906 datasheet(40/531 Pages) RENESAS

tên linh kiện	7906

Giải thích chi tiết về linh kiện	16-BIT SINGLE-CHIP MICROCOMPUTER

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7906 Group User’s Manual Rev.2.0

2-19

CENTRAL PROCESSING UNIT (CPU)

2.5 Processor modes

The M37906 operates only in the single-chip mode. Figure 2.5.1 shows the memory assignment of the

M37906.

Unused area

Internal

ROM area

(Note 2)

Unused area

016

FF16

SFR area

Single-chip mode

Internal

RAM area

(Note 1)

Notes 1: When the internal RAM area is followed by an unused area, do not assign a program to

the last 8 bytes of the internal RAM area.

2: Do not assign a program to the last 8 bytes of the internal ROM area.

3: The memory assignment of the internal area varies according to the product type.

Refer to section “Appendix 11. Memory assignment of 7906 Group,” or the latest datasheets, catalogs.

Fig. 2.5.1 Memory assignment of M37906

2.5.1 Single-chip mode

In this mode, ports P1, P2, P5 to P7 serve as programmable I/O ports. (When an internal peripheral device

is used, the corresponding port pin serves as the device’s I/O pin).

In this mode, only the internal area (SFR, internal RAM, and internal ROM) can be accessed.

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