HD6473228P10V Datasheet, PDF (190/301 Pages) Renesas Technology Corp – Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp

9.3 Operation
9.3.1 Overview
The SCI supports serial data transfer in both asynchronous and synchronous modes.
The communication format depends on settings in the SMR as indicated in table 9-5. The clock
source and usage of the SCK pin depend on settings in the SMR and SCR as indicated in table 9-6.
Table 9-5. Communication Formats Used by SCI
SMR
C/A CHR PE
0
0
0
1
1
0
1
1
——
STOP
0
1
0
1
0
1
0
1
—
Mode
Asynchronous
Synchronous
Format
8-Bit data
7-Bit data
8-Bit data
Parity
None
Yes
None
Yes
—
Stop bit
length
1
2
1
2
1
2
1
2
—
Table 9-6. SCI Clock Source Selection
SMR
C/A
0
(Async
mode)
SCR
CKE1
0
1
1
0
(Sync
mode) 1
CKE0
0
1
0
1
0
1
0
1
Clock
source
Internal
External
Internal
External
SCK pin
Input/output port*
Serial clock output
at bit rate
Serial clock input
at 16 × bit rate
Serial clock output
Serial clock input
* Not used by the SCI.
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