r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 556

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 25.12
RDRF bit in
SSSR register
RSSTP bit in
SSCRH register
RDRF bit in
SSSR register
RSSTP bit in
SSCRH register
Processing
by program
Processing
by program
• CPHS bit = 0 (data download at even edges), CPOS bit = 0 (“H” when clock stops), and BS3
• CPHS bit = 1 (data download at odd edges), CPOS bit = 0 (“H” when clock stops), and BS3 to
to BS0 = 1000b (8 bits)
BS0 = 1000b (8 bits)
(output)
(output)
SSCK
SSCK
SCS
SCS
SSI
SSI
Example of Synchronous Serial Communication Unit Operation during Data
Reception (4-Wire Bus Communication Mode, 8-Bit SSU Data Transfer Length)
BS0 to BS3: Bits in SSBR register
CPHS and CPOS: Bits in SSMR register
Dummy read in
SSRDR register
Dummy read in
SSRDR register
b7
b7
1 frame
RXI interrupt request
is generated
RXI interrupt request
is generated
1 frame
b0
Data read in SSRDR
register
Data read in SSRDR
register
b0
b7
b7
25. Synchronous Serial Communication Unit (SSU)
1 frame
RXI interrupt request
is generated
RXI interrupt request
is generated
1 frame
b0
b0
Set RSSTP
bit to 1
Set RSSTP
bit to 1
b7
b7
Data read in SSRDR
register
Data read in SSRDR
register
RXI interrupt request
is generated
RXI interrupt request
is generated
High-impedance
b0
High-impedance
b0
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