Renesas PROM Programming Adapter PCA7447FP Informacje Techniczne Pobierz pdf (Strona 13)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C8 Group

[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

rocessor mo

b1 b0

0 0 : Single-chip mode

0 1 :

1 0 :

1 1 :

Stack page selection bit

0 : 0 page

1 : 1 page

Not used (returns “1” when read)

(Do not write “0” to this bit)

Sub-clock (X

CIN–

COUT) oscillating bit

0 : Stopped

1 : Oscillating

Main clock (X

IN–

OUT) stop bit

0 : Oscillating

1 : Stopped

Main clock division ratio selection bit

0 : f(X

IN)/2 (high-speed mode)

1 : f(X

IN)/8 (middle-speed mode)

Internal system clock selection bit

0 : X

IN–XOUT selected (middle-/high-speed mode)

1 : X

CIN–XCOUT selected (low-speed mode)

CPU

e reg

ster

(CPUM

(CM)

: a

ress 003

)

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 56 57

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