M37271MF datasheet(9/98 Pages) RENESAS

Part #	M37271MF

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

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Manufacturer	RENESAS [Renesas Technology Corp]

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MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

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

and ON-SCREEN DISPLAY CONTROLLER

8

FUNCTIONAL DESCRIPTION

Central Processing Unit (CPU)

The M37271MF-XXXSP uses the standard 740 family instruction set.

Refer to the table of 740 family addressing modes and machine in-

structions or the SERIES 740

< Software > User’s Manual for details

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 instruction can be used.

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.

Fig. 1. Structure of CPU mode register

70

11

0

CPU mode register

(CPUM (CM) : address 00FB16)

Processor mode bits

b1 b0

0 0 : Single-chip mode

0 1 :

1 0 :

1 1 :

Stack page selection bit (Note)

0 : Zero page

1 : 1 page

Fix these bits to “1.”

Note: Please beware of this bit when programming because it

is set to “1” after the reset release.

XCOUT drivability selection bit

0 : Low drive

1 : High drive

Main colock (XIN–XOUT) stop bit

0 : Oscillating

1 : Stopped

Internal system clock selection bit

0 : XIN–XOUT selected (high-speed mode)

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

Not available

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