Datasheet

Section 20 Synchronous Serial Communication Unit (SSU)
Page 1124 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
SCS
SSCK
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
SSO
TDRE
TEND
LSI operation
User operation
TXI interrupt
generated
TEI interrupt
generated
TEI interrupt
generated
TXI interrupt
generated
Data written to SSTDR0
Data written to SSTDR0
1 frame
SSTDR0
(LSB first transmission)
SSTDR0
(MSB first transmission)
1 frame
Figure 20.5 (1) Example of Transmission Operation (SSU Mode)
When 8-bit data length is selected (SSTDR0 is valid) with CPOS = 0 and CPHS = 0
Bit
0
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
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
Bit
1
Bit
2
Bit
3
Bit
4
Bit
5
Bit
6
Bit
7
LSI operation
User operation
Data written to SSTDR0 and SSTDR1
SSTDR1
SCS
SSCK
TDRE
TEND
SSO
(LSB first)
SSO
(MSB first)
SSTDR0
SSTDR0 SSTDR1
1 frame
TXI interrupt generated
TEI interrupt generated
Figure 20.5 (2) Example of Transmission Operation (SSU Mode) When 16-bit data length is
selected (SSTDR0 and SSTDR1 are valid) with CPOS = 0 and CPHS = 0