M38B57MFH-XXXXFP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M38B57MFH-XXXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit and

the internal system clock selection bit etc.

The CPU mode register is allocated at address 003B16.

b7

b0

CPU mode register

(CPUM: 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: Page 0

1: Page 1

XCOUT drivability selection bit

0: Low drive

1: High drive

Port XC switch bit

0: I/O port function

1: XCIN–XCOUT oscillating function

Main clock (X IN–XOUT) stop bit

0: Oscillating

1: Stopped

Main clock division ratio selection bit

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

1: f(XIN)/4 (middle-speed mode)

Internal system clock selection bit

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

1: XCIN-XCOUT selection (low-speed mode)

Fig. 7 Structure of CPU mode register

HARDWARE

FUNCTIONAL DESCRIPTION

38B5 Group User’s Manual

1-11

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