Renesas SH7709S Manual Do Utilizador
Rev. 5.00, 09/03, page 454 of 760
Table 14.9
Serial Mode Register Settings and SCI Communication Formats
SCSMR Settings
SCI Communication Format
Bit 7
C/
C/
A
A
A
A
Bit 6
CHR
CHR
Bit 5
PE
PE
Bit 2
MP
MP
Bit 3
STOP
STOP
Mode
Data
Length
Length
Parity
Bit
Bit
Multipro-
cessor Bit
cessor Bit
Stop Bit
Length
Length
0
0
0
0
0
Asynchronous
8-bit
Not set
Not set
1 bit
1
2 bits
1
0
Set
1 bit
1
2 bits
1
0
0
7-bit
Not set
1 bit
1
2 bits
1
0
Set
1 bit
1
2 bits
0
*
1
0
8-bit
Not set
Set
1 bit
*
1
2 bits
1
*
0
7-bit
1 bit
*
1
Asynchronous
(multiprocessor
format)
(multiprocessor
format)
2 bits
1
*
*
*
*
Synchronous
8-bit
Not set
None
Note:
Asterisks (
*
) indicate don’t care bits.
Table 14.10 SCSMR and SCSCR Settings and SCI Clock Source Selection
SCSMR
SCSCR Settings
SCI Transmit/Receive Clock
Bit 7
C/
C/
A
A
A
A
Bit 1
CKE1
CKE1
Bit 0
CKE0
CKE0
Mode
Clock
Source
Source
SCK
Pin Function
Pin Function
0
0
0
Internal
SCI does not use the SCK pin
1
Outputs a clock with frequency
matching the bit rate
matching the bit rate
1
0
External
1
Asynchronous
mode
mode
Inputs a clock with frequency 16
times the bit rate
times the bit rate
1
0
0
Internal
Outputs the synchronous clock
1
1
0
External
Inputs the synchronous clock
1
Synchronous
mode
mode