Datasheet

Section 20 Synchronous Serial Communication Unit (SSU)
Page 1130 of 1408 R01UH0309EJ0500 Rev. 5.00
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
Yes
[1]
[2]
[3]
[4]
[5]
[6]
[1] Initial setting:
Specify the receive data format.
[2] Start reception:
When SSRDR is dummy-read with RE = 1, reception is
started.
[3], [6] Receive error processing:
When a receive error occurs, execute the designated error
processing after reading the ORER bit in SSSR. After that,
clear the ORER bit to 0. While the ORER bit is set to 1,
transmission or reception is not resumed.
[4] To continue single reception:
When continuing single reception, wait for time of t
SUcyc
while the RDRF flag is set to 1 and then read receive data
in SSRDR.
The next single reception starts after reading receive data
in SSRDR.
[5] To complete reception:
To complete reception, read receive data after clearing the
RE bit to 0. When reading SSRDR without clearing the RE
bit, reception is resumed.
No
Yes
Yes
No
Start
Initial setting
Dummy-read SSRDR
Read SSSR
RDRF = 1?
ORER = 1?
Consecutive data
reception?
Read received data in SSRDR
RDRF automatically cleared
RE = 0
Read receive data in SSRDR
End reception
Overrun error processing
Clear ORER in SSSR
End reception
Note: Hatching boxes represent SSU internal operations.
No
Figure 20.8 Flowchart Example of Data Reception (SSU Mode)