7220 datasheet(256/303 Pages) RENESAS

Part #	7220

Description	8-BIT SINGLE-CHIP MICROCOMPUTER

PDF	303 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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256 / 303 page

7220 Group User’s Manual

APPENDIX

6.7 Control registers

6-37

Fig. 6.7.12 Serial I/O mode register

b7 b6 b5 b4 b3 b2 b1 b0

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

Name

Functions

After reset RW

Serial I/O Mode Register

0, 1 Internal synchronous

clock selection bits

(SM0, SM1)

b1 b0

0: f(XIN)/4

1: f(XIN)/16

0: f(XIN)/32

1: f(XIN)/64

Synchronous clock

selection bit (SM2)

Serial I/O port

selection bit (SM3)

Transfer direction

selection bit (SM5)

0: P20, P21 functions

as port

1: SCLK, SOUT

0: External clock

1: Internal clock

0: LSB first

1: MSB first

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

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

Fix this bit to “0.”

Serial input pin

selection bit (SM6)

0: Input signal from S IN pin

1: Input signal from S OUT pin

R—

Address 00DC16

7220 Datasheet(PDF) 256 Page - Renesas Technology Corp

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