M38C31M7AXXXFS datasheet(26/224 Pages) RENESAS

部件名	M38C31M7AXXXFS

功能描述	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	224 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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26 / 224 page

38C3 Group User’s Manual

HARDWARE

1-11

[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

FUNCTIONAL DESCRIPTION

Not available

Processor mode bits

b1 b0

0 : Single-chip mode

1 :

0 :

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.)

Port XC switch bit

0 : I/O port

1 : XCIN, XCOUT

Main clock ( XIN–XOUT) stop bit

0 : Operating

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)

CPU mode register

(CPUM (CM) : address 003B 16)

M38C31M7AXXXFS 数据表(PDF) 26 Page - Renesas Technology Corp

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