M38C21F3DXXXHP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M38C21F3DXXXHP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit and

the control bit for the internal system clock.

The CPU mode register is allocated at address 003B16.

MITSUBISHI MICROCOMPUTERS

38C2 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

b7

Fig. 7 Structure of CPU mode register

b0

CPU mode register

(CPUM (CM) : address 003B16)

Processor mode bits

b1 b0

0 0 : Single-chip mode

0 1:

1 0 : Not available

1 1:

Stack page selection bit

0 : RAM in the zero page is used as stack area

1 : RAM in page 1 is used as stack area

Not used (returns “1” when read)

(Do not write “0” to this bit.)

Main clock (XIN–XOUT) division ratio selection bits

b5 b4

0 0 : XIN/8 (frequency/8 mode)

0 1 : XIN/4 (frequency/4 mode)

1 0 : XIN/2 (frequency/2 mode)

1 1 : XIN (through mode)

System clock control bits

b7 b6

0 0 : XIN stop, XCIN oscillating, system clock = XCIN

0 1 : XIN oscillating, XCIN stop, system clock = XIN

1 0 : XIN oscillating, XCIN oscillating, system clock = XCIN

1 1 : XIN oscillating, XCIN oscillating, system clock = XIN

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