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7641

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

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MITSUBISHI MICROCOMPUTERS

7641 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

[CPU Mode Registers A, B (CPUMA, CPUMB)] 000016, 000116

The CPU mode register contains the stack page select bit and the

CPU operating mode select bit and so on.

The CPU mode registers are allocated at address 000016, 000116.

s Notes

Do not use the microprocessor mode in the flash memory version.

b7

b0

1

CPU mode register A (address 000016)

CPMA

Processor mode bits

b1b0

0 0: Single-chip mode

0 1: Memory expansion mode

1 0: Microprocessor mode (Note 1)

1 1: Not available

Stack page select bit

0: Page 0

1: Page 1

Fix to “1”.

Sub-clock (XCIN-XCOUT) stop bit

0: Oscillating

1: Stopped

Main clock (XIN-XOUT) stop bit

0: Oscillating

1: Stopped

Internal system clock select bit (Note 2)

0: External clock (XIN-XOUT or XCIN-XCOUT)

1: fSYN

External clock select bit

0: XIN-XOUT

1: XCIN-XCOUT

Notes 1: This is not available in the flash memory version.

2: When (CPMA 6, 7) = (0, 0), the internal system clock can be selected

between f(XIN) or f(XIN)/2 by CCR7.

The internal clock φ is the internal system clock divided by 2.

b7

10

b0

CPU mode register B (address 000116)

CPMB

Slow memory wait select bits

b1b0

0 0: No wait

0 1: One-time wait

1 0: Two-time wait

1 1: Three-time wait

Slow memory wait mode select bits

b3b2

0 0: Software wait

0 1: Not available

1 0: RDY wait

1 1: Software wait plus RDY input anytime wait

Expanded data memory access bit

0: EDMA output disabled

1: EDMA output enabled

HOLD function enable bit

0: HOLD function disabled

1: HOLD function enabled

Resereved bit (“0” at read/write)

Fix to “1”.

Fig. 8 Structure of CPU mode register

11

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