373
Synchronous Mode:
• The communication format has a fixed eight-bit data length.
• In receiving, it is possible to detect overrun errors (ORER).
• An internal or external clock can be selected as the SCI clock source.
When an internal clock is selected, the SCI operates using the on-chip baud rate generator,
and outputs a serial clock signal to external devices.
When an external clock is selected, the SCI operates on the input serial clock. The on-chip
baud rate generator is not used.
Table 13.8 Serial Mode Register Settings and SCI Communication Formats
SMR Settings SCI Communication Format
Mode
Bit 7:
C/A
Bit 6:
CHR
Bit 5:
PE
Bit 2:
MP
Bit 3:
STOP
Data
Length
Parity
Bit
Multipro-
cessor Bit
Stop Bit
Length
Asynchronous 0 0 0 0 0 8-bit Absent Absent 1 bit
1 2 bits
1 0 Present 1 bit
1 2 bits
1 0 0 7-bit Absent 1 bit
1 2 bits
1 0 Present 1 bit
1 2 bits
0 * 1 0 8-bit Absent Present 1 bit
* 1 2 bits
1 * 0 7-bit 1 bit
* 1 2 bits
Synchronous 1 **** 8-bit Absent None
Note: Asterisks (*) in the table indicate don’t-care bits.
Asynchronous
(multiprocessor
format)
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