7721 datasheet(45/577 Pages) RENESAS

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7721 Group User’s Manual

CENTRAL PROCESSING UNIT (CPU)

2–22

2.4 Memory assignment

Bit

Bit name

Functions

At reset

Fix this bit to “0.”

Software reset bit

Interrupt priority detection time

select bits

Stack bank select bit

The microcomputer is reset by

writing “1” to this bit. The value is

“0” at reading.

0 0 : 7 cycles of

0 1 : 4 cycles of

1 0 : 2 cycles of

1 1 : Do not select.

0 : Bank 016

1 : Bank FF16

b5 b4

Processor mode register 0 (Address 5E16)

–

Fix this bit to “0.”

Nothing is assigned.

The value is “1” at reading.

Wait bit

0 : Software Wait is inserted when

accessing external area.

1 : No software Wait is inserted

when accessing external area.

Processor mode register 1 (Address 5F16)

Bit

7 to 2

Bit name

At reset

Functions

Notes 1: For the M37721S1BFP, fix bit 1 to “0.”

2: For the M37721S2BFP, set bit 1 before setting the stack pointer.

Nothing is assigned.

–

Undefined

Internal RAM area select bit

(Notes 1, 2)

0 : 512 bytes (addresses 8016 to 27F16)

1 : 1024 bytes (addresses 8016 to 47F16)

Nothing is assigned.

–

Undefined

: Bits 0 to 6 are not used for the memory assignment.

Fig. 2.4.4 Structure of processor mode registers 0, 1

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