Figure 14.5 Example Of Transmission Operation (Ssu Mode) - Renesas H8SX/1500 Series Hardware Manual

Section 14 Synchronous Serial Communication Unit (SSU)
(1) When 8-bit data length is selected (SSTDR0 is valid) with CPOS = 0 and CPHS = 0
SCS
SSCK
SSO
TDRE
TEND
LSI operation
User operation
(2) When 16-bit data length is selected (SSTDR0 and SSTDR1 are valid) with CPOS = 0 and CPHS = 0
SCS
SSCK
SSO
(LSB first)
SSO
(MSB first)
TDRE
TEND
LSI operation
User operation
(3) When 32-bit data length is selected (SSTDR0 and SSTDR3 are valid) with CPOS = 0 and CPHS = 0
SCS
SSCK
SSO
(LSB first)
SSO
(MSB first)
TDRE
TEND
LSI operation
User operation

Figure 14.5 Example of Transmission Operation (SSU Mode)

Rev. 3.00 Mar. 14, 2006 Page 532 of 804
REJ09B0104-0300
1 frame
Bit Bit Bit Bit Bit Bit
0 1 2 3 4 5
SSTDR0
(LSB first transmission)
TXI interrupt
TEI interrupt
generated
Data written to SSTDR0
Bit Bit Bit Bit Bit Bit
0 1 2 3 4 5
SSTDR1
Bit Bit Bit Bit Bit Bit
7 6 5 4 3 2
SSTDR0
Data written to SSTDR0 and SSTDR1
1 frame
Bit Bit Bit Bit
to to
0 7 0 7
SSTDR SSTDR
Bit Bit Bit Bit
to to
7 0 7 0
SSTDR SSTDR
TXI interrupt generated TEI interrupt generated
Data written to SSTDR0 to SSTDR1
1 frame
Bit Bit Bit Bit Bit
6 7 7 6 5
SSTDR0
(MSB first transmission)
TXI interrupt
generated
generated
Data written to SSTDR0
1 frame
Bit Bit Bit Bit Bit Bit Bit
6 7 0 1 2 3 4
SSTDR0
Bit Bit Bit Bit Bit Bit Bit
1 0 7 6 5 4 3
SSTDR1
TXI interrupt generated
Bit Bit Bit Bit
to to
0 7 0 7
SSTDR SSTDR
Bit Bit Bit Bit
to to
7 0 7 0
SSTDR SSTDR
Bit Bit Bit Bit Bit
4 3 2 1 0
TEI interrupt
generated
Bit Bit Bit
5 6 7
Bit Bit Bit
2 1 0
TEI interrupt generated