M38748E7F 데이터 시트보기 (PDF) - Mitsumi

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M38748E7F

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

FUNCTIONAL DESCRIPTION

CENTRAL PROCESSING UNIT (CPU)

The 3874 group uses the standard 740 Family instruction set. Re-

fer to the table of 740 Family addressing modes and machine

instructions or the 740 Family Software Manual for details on the

instruction set.

Machine-resident 740 Family instructions are as follows:

The FST and SLW instructions cannot be used.

The STP, WIT, MUL, and DIV instructions can be used.

[CPU Mode Register (CPUM)] 003B16

The CPU mode register contains the stack page selection bit and

the internal system clock selection bit etc.

The CPU mode register is allocated at address 003B16.

b7

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 : Page 0

1 : Page 1

XCOUT drivability selection bit

0 : Low drive

1 : High drive

Port XC switch bit

0 : I/O port function

1 : XCIN–XCOUT oscillating function

Main clock (X IN–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 : φ = f(XIN) (double-speed mode)

Note: When setting b7 to b3, refer to notes of Figure 71.

Fig. 8 Structure of CPU mode register

MITSUBISHI MICROCOMPUTERS

3874 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

11

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