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R28 Datasheet(PDF) 296 Page - Renesas Technology Corp

Part # R28
Description  RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES
PDF  473 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R28 Datasheet(HTML) 296 Page - Renesas Technology Corp

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R8C/28 Group, R8C/29 Group
16. Clock Synchronous Serial Interface
Rev.2.10
Sep 26, 2008
Page 277 of 441
REJ09B0279-0210
Figure 16.20
Example of Clock Synchronous Serial I/O with Chip Select Operation during Data
Reception (4-Wire Bus Communication Mode)
SSCK
b0
SSI
• CPHS bit = 0 (data download at even edges) and CPOS bit = 0 (“H” when clock stops)
b7
SCS
(output)
SSCK
• CPHS bit = 1 (data download at odd edges) and CPOS bit = 0 (“H” when clock stops)
CPHS and CPOS: Bit in SSMR register
1 frame
RDRF bit in
SSSR register
0
1
RSSTP bit in
SSCRH register
0
1
Dummy read in
SSRDR register
Processing
by program
1 frame
High-impedance
b0
b7
High-impedance
SCS
(output)
b7
b0
Data read in SSRDR
register
RXI interrupt request
is generated
RXI interrupt request
is generated
Data read in SSRDR
register
RXI interrupt request
is generated
b0
b7
b0
b7
b7
b0
SSI
1 frame
RDRF bit in
SSSR register
0
1
RSSTP bit in
SSCRH register
0
1
Dummy read in
SSRDR register
Processing
by program
1 frame
Data read in SSRDR
register
RXI interrupt request
is generated
RXI interrupt request
is generated
RXI interrupt request
is generated
Set RSSTP
bit to 1
Data read in SSRDR
register
Set RSSTP
bit to 1



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