R8CSLASH20 datasheet(306/501 Pages) RENESAS

306 / 501 page

R8C/20 Group, R8C/21 Group

16. Clock Synchronous Serial Interface

Rev.2.00 Aug 27, 2008

Page 290 of 458

REJ09B0250-0200

Figure 16.7

SSMR2 Register

SS Mode Register 2

Symbol

Address

After Reset

SSMR2

00BDh

00h

Bit Symbol

Bit Name

Function

SCS

_____

pin open drain output select 0 : CMOS output

1 : N-channel open drain output

SCS

_____

pin select bit(2)

b5 b4

0 0 : Functions as port

0 1 : Function as SCS

_____

input pin

1 0 : Function as SCS

_____

output pin(3)

1 1 : Functions as SCS

_____

output pin(3)

NOTES:

The BIDE bit is disabled w hen the SSUMS bit is set to 0 (clock synchronous communication mode).

BIDE

Bidirectional mode enable bit(1,4)

0 : Standard mode (communicates using 2

pins of data input and data output)

1 : Bidirectional mode (communicates using

1 pin of data input and data output)

This bit functions as the SCS

_____

input pin before starting transfer.

set to 0 (clock synchronous communication mode).

The SSI pin and SSO pin corresponding port direction bits are set to 0 (input mode) w hen the SOOS bit is set to 0

(CMOS output).

0 : Clock synchronous communication mode

1 : Four-w ire bus communication mode

SSCK pin open drain output

select bit

0 : CMOS output

1 : N-channel open drain output

CSS1

Clock synchronous serial I/O w ith

chip select mode select bit(1)

SSO pin open drain output select

bit(1)

0 : CMOS output(5)

1 : N-channel open drain output

CSS0

SOOS

SCKOS

SSUMS

CSOS

b2 b1

b7 b6 b5 b4

Refer to 16.2.2.1 Association betw een Data I/O Pins and SS Shift Register for the combination of the data I/O

pin.

The SCS

______

pin functions as a port, regardless of the contents of the CSS0 and CSS1 bits w hen the SSUMS bit is

SCKS

SSCK pin select bit

0 : Functions as port

1 : Functions as serial clock pin

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