Datasheet

Section 17 Synchronous Serial Communication Unit (SSU)
Rev. 2.00 Aug. 20, 2008 Page 572 of 1198
REJ09B0403-0200
SCS
SSCK
(1) When 8-bit data length is selected (SSTDR0 is valid) with CPOS = 0 and CPHS = 0
(2) When 16-bit data length is selected (SSTDR0 and SSTDR1 are valid) with CPOS = 0 and CPHS = 0
(3) When 32-bit data length is selected (SSTDR0, SSTDR1, SSTDR2, and SSTDR3 are valid)
with CPOS = 0 and CPHS = 0
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
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
Bit
7
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
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
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
SSO
TDRE
TEND
LSI operation
User operation
LSI operation
User operation
LSI operation
User operation
TXI interrupt
generated
TEI interrupt
generated
TEI interrupt
generated
TXI interrupt
generated
Data written to SSTDR0
Data written to SSTDR0 and SSTDR1
Data written to SSTDR0
SSTDR1
SCS
SSCK
TDRE
TEND
SSO
(LSB first)
SSO
(MSB first)
SSO
(LSB first)
SSO
(MSB first)
SSTDR0
SSTDR0 SSTDR1
SCS
SSCK
TDRE
TEND
SSTDR0
SSTDR3
SSTDR1
SSTDR2
SSTDR2
SSTDR1
SSTDR3
SSTDR0
1 frame
1 frame
1 frame
SSTDR0
(LSB first transmission)
SSTDR0
(MSB first transmission)
1 frame
TXI interrupt generated
TEI interrupt generated
Data written to SSTDR0, SSTDR1, SSTDR2, and SSTDR3
TXI interrupt generated TEI interrupt generated
Figure 17.5 Example of Transmission Operation (SSU Mode)