M37225M6_15 datasheet(13/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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13 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 11 of 124

REJ03B0136-0100Z

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

CPU Mode Register

b7 b6 b5 b4 b3 b2 b1 b0

B

After reset R W

0, 1

2

3 to 5

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

6, 7

0

CPU mode register (CM) [Address 00FB16]

R W

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

1

0

Fix these bits to “0.”

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