Renesas SH7709S Manual Do Utilizador
Rev. 5.00, 09/03, page 456 of 760
Transmit/Receive Formats: Table 14.11 lists the 12 communication formats that can be selected
in asynchronous mode. The format is selected by settings in the serial mode register (SCSMR).
in asynchronous mode. The format is selected by settings in the serial mode register (SCSMR).
Table 14.11 Serial Communication Formats (Asynchronous Mode)
SCSMR Bits
Serial Transmit/Receive Format and Frame Length
CHR PE
MP
STOP
1
2
3
4
5
6
7
8
9
10
11
12
0
0
0
0
START
8-bit data
STOP
0
0
0
1
START
8-bit data
STOP STOP
0
1
0
0
START
8-bit data
P
STOP
0
1
0
1
START
8-bit data
P
STOP STOP
1
0
0
0
START
7-bit data
STOP
1
0
0
1
START
7-bit data
STOP STOP
1
1
0
0
START
7-bit data
P
STOP
1
1
0
1
START
7-bit data
P
STOP STOP
0
—
1
0
START
8-bit data
MPB
STOP
0
—
1
1
START
8-bit data
MPB
STOP STOP
1
—
1
0
START
7-bit data
MPB
STOP
1
—
1
1
START
7-bit data
MPB
STOP STOP
Notes:
— :
Don’t care bits
START: Start bit
STOP:
Stop bit
P:
Parity bit
MPB:
Multiprocessor bit
Clock: An internal clock generated by the on-chip baud rate generator or an external clock input
from the SCK pin can be selected as the SCI transmit/receive clock. The clock source is selected
by the C/
from the SCK pin can be selected as the SCI transmit/receive clock. The clock source is selected
by the C/
A bit in the serial mode register (SCSMR) and bits CKE1 and CKE0 in the serial control
register (SCSCR) (table 14.10).
When an external clock is input at the SCK pin, it must have a frequency equal to 16 times the
desired bit rate.
desired bit rate.