Datasheet

Section 17 Synchronous Serial Communication Unit (SSU)
Rev. 2.00 Aug. 20, 2008 Page 575 of 1198
REJ09B0403-0200
SCS
SSCK
(1) When 8-bit data length is selected (SSRDR0 is valid) with CPOS = 0 and CPHS = 0
(2) When 16-bit data length is selected (SSRDR0 and SSRDR1 are valid) with CPOS = 0 and CPHS = 0
(3) When 32-bit data length is selected (SSRDR0, SSRDR1, SSRDR2, and SSRDR3 are valid)
with CPOS = 0 and CPHS = 0
SSI
RDRF
SSRDR1
SCS
SSCK
RDRF
SSRDR0
SSRDR0 SSRDR1
SCS
SSCK
RDRF
SSRDR0
SSRDR3
SSRDR1
SSRDR2
SSRDR2
SSRDR1
SSRDR3
SSRDR0
1 frame
1 frame
1 frame
Bit
0
Bit
0
Bit
1
Bit
1
Bit
2
Bit
2
Bit
3
Bit
3
Bit
4
Bit
4
Bit
5
Bit
5
Bit
6
Bit
6
Bit
7
Bit
7
LSI operation
Dummy-read SSRDR0
Dummy-read SSRDR0 and SSRDR1
Read SSRDR0User operation
LSI operation
User operation
LSI operation
User operation
SSTDR0 (LSB first transmission) SSTDR0 (MSB first transmission)
RXI interrupt
generated
RXI interrupt generated
RXI interrupt
generated
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
SSI
(LSB first)
SSI
(MSB first)
Bit
0
to to to to
to to to to
Bit
0
Bit
7
Bit
7
Bit
0
Bit
7
Bit
0
Bit
7
Bit
0
Bit
7
Bit
0
Bit
7
Bit
0
Bit
7
Bit
0
Bit
7
SSI
(LSB first)
SSI
(MSB first)
Dummy-read SSRDR0
RXI interrupt generated
Figure 17.7 Example of Reception Operation (SSU Mode)