M38031F3L-XXXSP Ver la hoja de datos (PDF) - Renesas Electronics

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M38031F3L-XXXSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Renesas Electronics 

3803 Group (Spec.L)

[CPU Mode Register (CPUM)] 003B16

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

internal system clock control bits, etc.

The CPU mode register is allocated at address 003B16.

b7

1

Fig 9. Structure of CPU mode register

b0 CPU mode register

(CPUM: address 003B16)

Processor mode bits

b1 b0

0 0 : Single-chip mode

0 1:

1 0 : Not available

1 1:

Stack page selection bit

0 : 0 page

1 : 1 page

Fix this bit to “1”.

Port XC switch bit

0 : I/O port function (stop oscillating)

1 : XCIN-XCOUT oscillating function

Main clock (XIN-XOUT) stop bit

0 : Oscillating

1 : Stopped

Main clock division ratio selection bits

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

Rev.1.00 Apr 2, 2007 Page 12 of 117

REJ03B0212-0100

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