M37512FCH-XXXHP datasheet(8/87 Pages) RENESAS

Part #	M37512FCH-XXXHP

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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8 / 87 page

Feb 18, 2005

page 8 of 85

REJ03B0122-0101

7512 Group

Fig. 6 Structure of CPU mode register

CPU mode register

(CPUM : address 003B16)

b7

b0

Note : All bits in this register are protected by protect mode.

Processor mode bits

b1 b0

0

0 : Single-chip mode

01 :

1

0 :

Not available

11 :

Stack page selection bit

0 : 0 page

1 : 1 page

Clock source switch bit

0 : Built-in high speed oscillating function

1: XCIN–XCOUT oscillation function

Port XC switch bit

0 : I/O port function (stop oscillation)

1: XCIN–XCOUT oscillation function

Main clock (XIN–XOUT) stop bit

0 : Oscillation

1 : Stopped

Main clock division ratio selection bits

b7 b6

00 :

φ = f(XIN)/2 (high-speed mode)

01 :

φ = f(XIN)/8 (middle-speed mode)

10 :

φ = f(XIN)/2 (low-speed mode)

1

1 : Not available

[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit, etc.

The CPU mode register is allocated at address 003B16.

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M37512FCH-XXXHP Datasheet(PDF) 8 Page - Renesas Technology Corp

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