38K2 datasheet(29/358 Pages) RENESAS

Il numero della parte	38K2

Spiegazioni elettronici	RENESAS 8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 38000 SERIES

PDF	358 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 15, 2006

page 10 of 130

38K2 Group

REJ09B0338-0200

HARDWARE

[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit and

the internal system clock selection bit.

The CPU mode register is allocated at address 003B16.

Fig. 7 Structure of CPU mode register

Processor mode bits

b1b0

00 : Single-chip mode

01 :

10 :

Not available

11 :

Stack page selection bit

0 : 0 page

1 : 1 page

Not used (returns “1” when read)

(Do not write “0” to this bit)

Not used (returns “0” when read)

(Do not write “1” to this bit)

System clock selection bit

0 : Main clock (XIN)

1 : fSYN

System clock division ratio selection bits

b7b6

00 :

φ = f(system clock)/8 (8-divide mode)

01 :

φ = f(system clock)/4 (4-divide mode)

10 :

φ = f(system clock)/2 (2-divide mode)

11 :

φ = f(system clock) (Through mode)

CPU mode register

(CPUM : address 003B16)

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