HD6435348R Hitachi Semiconductor, HD6435348R Datasheet - Page 284

• Manufacturer Part Number: HD6435348R
• Description: Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

14.3 Operation
14.3.1 Overview
Each serial communication interface channel supports serial data transfer in both asynchronous
and synchronous modes.
The communication format depends on settings in the SMR as indicated in table 14-5. The clock
source and usage of the SCK pin depend on settings in the SMR and SCR as indicated in table 14-6.
Table 14-5 Communication Formats Used by SCI
C/A
0
1
Table 14-6 SCI Clock Source Selection
SMR
C/A
0
(Async
mode)
1
(Sync
mode)
* Cannot be used by the SCI.
Transmitting and receiving operations in the two modes are described next.
CHR
0
1
—
CKE1
0
1
0
1
SMR
SCR
PE
0
1
0
1
—
CKE0
0
1
0
1
0
1
0
1
STOP
0
1
0
1
0
1
0
1
—
Clock
Source
Internal
External
Internal
External
Mode
Asynchronous
Synchronous
SCK Pin
I/O port*
Clock output at same frequency as baud rate
Clock input at 16 times the baud rate frequency
Serial clock output
Serial clock input
270
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
—