M38045F2HKP datasheet(269/387 Pages) RENESAS

No. de pieza	M38045F2HKP

Descripción Electrónicos	8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	387 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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2-145

APPLICATION

2.11

Clock generating circuit

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

2.11 Clock generating circuit

This paragraph explains how to set the registers relevant to the clock generating circuit and describes an

application example.

2.11.1 Relevant registers

Fig. 2.11.1 Structure of CPU mode register

CPU mode register

b7 b6 b5 b4 b3 b2 b1 b0

CPU mode register

(CPUM: address 003B16)

00 : Single-chip mode

01 : Not available

10 : Not available

11 : Not available

Name

Functions

At reset R W

0 : 0 page

1 : 1 page

0: Oscillating

1: Stopped

Processor mode

bits

Stack page

selection bit

Port Xc switch bit

Fix this bit to “1”.

Main clock (XIN-

XOUT) stop bit

Main clock division

ratio selection bits

b1 b0

b7 b6

0 0:

φ=f(XIN)/2

(high-speed mode)

0 1:

φ=f(XIN)/8

(middle-speed mode)

1 0:

φ=f(XCIN)/2

(low-speed mode)

1 1: Not available

0: I/O port function

(oscillation stopped)

1: XCIN-XCOUT oscillation

function

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