Hardware manual

Rev. 3.0, 09/98, page 206 of 361
Table 10.5 Communication Formats Used by SCI
SMR settings Communication Format
Bit 7
C/A
Bit 6
CHR
Bit 2
MP
Bit 5
PE
Bit 3
STOP Mode
Data
Length
Multipro-
cessor Bit
Parity
Bit
Stop-Bit
Length
00000Asynchronous mode8 bitsNoneNone1 bit
12 bits
1 0 Present 1 bit
12 bits
1 0 0 7 bits None 1 bit
12 bits
1 0 Present 1 bit
12 bits
010 8 bits Present None 1 bit
12 bits
1 0 7 bits 1 bit
1
Asynchronous mode
(multiprocessor
format)
2 bits
1 Synchronous mode 8 bits None None
Table 10.6 SCI Clock Source Selection
SMR SCR
Serial Transmit/Receive Clock
Bit 7
C/A
Bit 1
CKE1
Bit 0
CKE0 Mode
Clock Source SCK Pin Function
0 0 0 Async Internal Input/output port (not used by SCI)
1 Serial clock output at bit rate
1 0 External Serial clock input at 16 × bit rate
1
1 0 0 Sync Internal Serial clock output
1
1 0 External Serial clock input
1