M37225M6_15 datasheet(31/128 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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M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 29 of 124

REJ03B0136-0100Z

Fig. 8.5.3 Serial I/O Mode Register

b7 b6 b5 b4 b3 b2 b1 b0

Serial I/O mode register (SM) [Address 00DC16]

BNameFunctions

After reset RW

Serial I/O Mode Register

0, 1Internal synchronous

clock selection bits

(SM0, SM1)

b1 b0

0 0: f(XIN)/4

0 1: f(XIN)/16

1 0: f(XIN)/32

1 1: f(XIN)/64

2

Synchronous clock

selection bit (SM2)

3

Serial I/O port

selection bit (SM3)

6

5

Transfer direction

selection bit (SM5)

0: P20, P21

1: SCLK, SOUT

0: External clock

1: Internal clock

0: LSB first

1: MSB first

0

RW

R W

RW

4

Fix this bit to “0.”

7

Nothing is assigned. This bit is a write disable bit.

When this bit is read out, the value is “0.”

0R —

Serial input pin

selection bit (SM6)

0: Input signal from SIN pin.

1: Input signal from SOUT pin.

0

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