M37272MAH 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M37272MAH

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

M37272M6H/M8H/MAH/MFH–XXXSP/FP

M37272E8SP/FP, M37272EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

8. FUNCTIONAL DESCRIPTION

8.1 CENTRAL PROCESSING UNIT (CPU)

This microcomputer uses the standard 740 Family instruction set.

Refer to the table of 740 Family addressing modes and machine

instructions or the SERIES 740 <Software> User’s Manual for de-

tails on the instruction set.

Machine-resident 740 Family instructions are as follows:

The FST, SLW instruction cannot be used.

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

8.1.1 CPU Mode Register

The CPU mode register contains the stack page selection bit and

internal system clock selection bit. The CPU mode register is allo-

cated at address 00FB16.

CPU Mode Register

b7 b6 b5 b4 b3 b2 b1 b0

1 1 0 0 CPU mode register (CM) [Address 00FB16]

B

Name

0, 1 Processor mode bits

(CM0, CM1)

2 Stack page selection

bit (CM2) (See note)

Functions

After reset R W

b1 b0

0 0: Single-chip mode

0 RW

0 1:

1 0: Not available

1 1:

0: 0 page

1: 1 page

1 RW

3, 4 Fix these bits to 1.

1 RW

5 XCOUT drivability

selection bit (CM5)

0: LOW drive

1: HIGH drive

6 Main Clock (XIN—XOUT)0: Oscillating

stop bit (CM6)

1: Stopped

1 RW

0 RW

7 Internal system clock 0: XIN—XOUT selected

0

selection bit

(high-speed mode)

(CM7)

1: XCIN—XCOUT selected

(high-speed mode)

Note: This bit is set to 1 after the reset release.

RW

Fig. 8.1.1 CPU Mode Register

Rev. 1.0

11

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