M38B72FD datasheet(12/110 Pages) RENESAS

Part #	M38B72FD

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PDF	110 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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12 / 110 page

38B7 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

[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.

Fig. 7 Structure of CPU mode register

CPU mode register

(CPUM: address 003B16)

Processor mode bits

b1b0

0 0 : Single-chip mode

0 1 :

1 0 :

Not available

1 1 :

Port XC switch bit

0 : I/O port function

1 : XCIN–XCOUT oscillating function

Main clock (XIN–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)

Stack page selection bit

0 : Page 0

1 : Page 1

Not used (return “1” when read)

(Do not write “0” to this bit.)

M38B72FD Datasheet(PDF) 12 Page - Renesas Technology Corp