Renesas PCA4738L-64A Technical Information PDF herunterladen (Seite 17)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

3822 Group

MITSUBISHI MICROCOMPUTERS

[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. 11 Structure of CPU mode register

Not available

Processor mode bits

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)

Port X

C switch bit

0 : I/O port function (stop oscillating)

1 : X

CIN–XCOUT oscillating function

Main clock (X

IN–XOUT) stop bit

0 : Oscillating

1 : Stopped

Main clock division ratio selection bit

0 : f(X

IN)/2 (high-speed mode)

1 : f(XIN)/8 (middle-speed mode)

Internal system clock selection bit

0 : X

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

1 : XCIN–XCOUT selected (low-speed mode)

CPU mode register

(CPUM (CM) : address 003B

16)

b7 b0

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 81 82

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Renesas PCA4738L-64A Technical Information Seite 17