M37272E8FP datasheet(11/129 Pages) RENESAS

Part #	M37272E8FP

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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M3727GM6/M8–XXXSP/FP M37272E8SP/FP

Rev.1.00

Apr 01, 2001

page 11 of 127

REJ03B0132-0100Z

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.

Fig. 8.1.1 CPU Mode Register

b7 b6 b5 b4 b3 b2 b1 b0

B

After reset RW

CPU Mode Register

0, 1

2

3, 4

0

1

Name

Functions

Processor mode bits

(CM0, CM1)

0 0: Single-chip mode

0 1:

1 0:

Not available

1 1:

Fix these bits to “1.”

1

Stack page selection

bit (CM2) (See note)

1

b1 b0

0: 0 page

1: 1 page

1

0

5

1

6

0

Main Clock (XIN–XOUT)

stop bit

(CM6)

CPU mode register (CM) [Address 00FB16]

R W

RW

R W

RW

XCOUT drivability

selection bit (CM5)

0: LOW drive

1: HIGH drive

0: Oscillating

1: Stopped

7

0

Internal system clock

selection bit

(CM7)

RW

0: XIN–XOUT selected

(high-speed mode)

1: XCIN–XCOUT selected

(high-speed mode)

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

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