7702 datasheet(44/217 Pages) RENESAS

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7702/7703 Group User’s Manual

CENTRAL PROCESSING UNIT (CPU)

2–18

2.4 Memory assignment

This section describes the internal area’s memory assignment. For more information about the external

area, refer also to section “2.5 Processor modes.”

2.4.1 Memory assignment in internal area

SFR (Special Function Register), internal RAM, and internal ROM are assigned in the internal area. Figure

2.4.1 shows the internal area’s memory assignment.

(1)

SFR area

The registers for setting internal peripheral devices are assigned at addresses 016 to 7F16. This area

is called SFR (Special Function Register). Figure 2.4.2 shows the SFR area’s memory assignment.

For each register in the SFR area, refer to each functional description in this manual.

For the state of the SFR area immediately after a reset, refer to section “13.1.2 State of CPU, SFR

area, and internal RAM area.”

(2)

Internal RAM area

The M37702M2BXXXFP (See Note) assigns the 512-byte static RAM at addresses 8016 to 27F16. The

internal RAM area is used as a stack area, as well as an area to store data. Accordingly, note that

set the nesting depth of a subroutine and multiple interrupts’ level not to destroy the necessary data.

(3)

Internal ROM area

The M37702M2BXXXFP (See Note) assigns the 16-Kbyte mask RAM at addresses C00016 to FFFF16.

Its addresses FFD616 to FFFF16 are the vector addresses, which are called the interrupt vector table,

for reset and interrupts. In the microprocessor mode and the external ROM version where use of the

internal ROM area is inhibited, assign a ROM at addresses FFD616 to FFFF16.

Note : Refer to “Appendix 1. Memory assignment” for other products.

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