SH7708 Datasheet, PDF (383/633 Pages) Renesas Technology Corp – SuperH™ RISC engine

Table 13.9 Serial Mode Register Settings and SCI Communication Formats
Mode
Asynchronous
SCSMR Settings
Bit 7 Bit 6 Bit 5 Bit 2
C/A CHR PE MP
00
0
0
1
1
0
1
Asynchronous
(multiprocessor
format)
0
*
1
*
1
*
*
Synchronous 1 *
*
*
Note: Asterisks (*) indicate don’t-care bits.
Bit 3
STOP
0
1
0
1
0
1
0
1
0
1
0
1
*
SCI Communication Format
Data Parity Multipro- Stop Bit
Length Bit
cessor Bit Length
8-bit Not used Not used 1 bit
2 bits
Used
1 bit
2 bits
7-bit Not used
1 bit
2 bits
Used
1 bit
2 bits
8-bit Not used Used
1 bit
2 bits
7-bit
1 bit
2 bits
8-bit
Not used None
Table 13.10 SCSMR and SCSCR Settings and SCI Clock Source Selection
SCSMR SCSCR Settings
SCI Transmit/Receive Clock
Mode
Bit 7
C/A
Bit 1 Bit 0
CKE1 CKE0
Clock
Source
SCK
Pin Function
Asynchronous 0
mode
0
0
1
Internal
SCI does not use the SCK pin
Outputs a clock with frequency
matching the bit rate
1
0
1
External
Inputs a clock with frequency 16
times the bit rate
Synchronous 1
mode
0
0
1
Internal
Outputs the serial clock
1
0
External
Inputs the serial clock
1
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