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M38220M3HFP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3822 Group

[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit and

the internal system clock selection bit.

The CPU mode register is allocated at address 003B16.

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

b7

Fig. 11 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 : 0 page

1 : 1 page

Not used (returns “1” when read)

(Do not write “0” to this bit)

Port XC switch bit

0 : I/O port function (stop oscillating)

1 : XCIN–XCOUT oscillating function

Main clock (XIN–XOUT) stop bit

0 : Oscillating

1 : Stopped

Main clock division ratio selection bit

0 : f(XIN)/2 (high-speed mode)

1 : f(XIN)/8 (middle-speed mode)

Internal system clock selection bit

0 : XIN–XOUT selected (middle-/high-speed mode)

1 : XCIN–XCOUT selected (low-speed mode)

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