M38504M6-FP データシートの表示（PDF） - Renesas Electronics

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M38504M6-FP

8-BIT CISC SINGLE-CHIP MICROCOMPUTER

Renesas Electronics 

[CPU Mode Register (CPUM)] 003B16

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

The CPU mode register is allocated at address 003B16.

HARDWARE

FUNCTIONAL DESCRIPTION

b7

1

Fig. 7 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

3850 Group (Spec. H) User’s Manual

1-11

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