Datasheet

Section 20 Synchronous Serial Communication Unit (SSU)
R01UH0309EJ0500 Rev. 5.00 Page 1125 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
Bit
0
Bit
1
to
Bit
7
Bit
6
LSI operation
User operation
SSO
(LSB first)
SSO
(MSB first)
SCS
SSCK
TDRE
TEND
SSTDR2 SSTDR1 SSTDR0
Bit
0
Bit
1
to
Bit
7
Bit
6
Bit
0
Bit
1
to
Bit
7
Bit
6
Bit
7
Bit
6
to
Bit
0
Bit
1
SSTDR0 SSTDR1 SSTDR2
Bit
7
Bit
6
to
Bit
0
Bit
1
Bit
7
Bit
6
to
Bit
0
Bit
1
1 frame
Data written to SSTDR0, SSTDR1, and SSTDR2
TXI interrupt generated TEI interrupt generated
Figure 20.5 (3) Example of Transmission Operation (SSU Mode) When 24-bit data length is
selected (SSTDR0, SSTDR1, and SSTDR2 are valid) with CPOS = 0 and CPHS = 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
LSI operation
User operation
SSO
(LSB first)
SSO
(MSB first)
SCS
SSCK
TDRE
TEND
SSTDR0
SSTDR3
SSTDR1
SSTDR2
SSTDR2
SSTDR1
SSTDR3
SSTDR0
1 frame
Data written to SSTDR0, SSTDR1, SSTDR2 and SSTDR3
TXI interrupt generated TEI interrupt generated
Figure 20.5 (4) Example of Transmission Operation (SSU Mode)
When 32-bit data length is selected (SSTDR0, SSTDR1, SSTDR2 and SSTDR3 are valid)
with CPOS = 0 and CPHS = 0