Table 12.7 Communication Formats Used by SCI
SMR Settings
Communication Format
Bit 7: Bit 6: Bit 2: Bit 5: Bit 3:
Data
Multipro-
Parity
Stop Bit
Length
C/A CHR MP
PE
STOP Mode
Length cessor Bit Bit
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
—
Asynchronous mode 8 bits
None
None
1 bit
2 bits
1
Present 1 bit
2 bits
1 bit
1
0
7 bits
None
2 bits
1
Present 1 bit
2 bits
0
1
—
Asynchronous mode 8 bits
(multiprocessor
format)
7 bits
Present
None
None
1 bit
2 bits
1 bit
1
2 bits
None
1
—
—
—
Synchronous mode
8 bits
Table 12.8 SCI Clock Source Selection
SMR
SCR
Serial Transmit/Receive Clock
Clock Source SCK Pin Function
Bit 7:
C/A
Bit 1: Bit 0:
CKE1 CKE0 Mode
0
0
1
0
1
0
1
0
1
0
1
0
1
Async
Sync
Internal
External
Internal
External
Input/output port (not used by SCI)
Serial clock output at bit rate
Serial clock input at 16 × bit rate
1
Serial clock output
Serial clock input
258
RENESAS [ RENESAS TECHNOLOGY CORP ]
