User’s Manual U11969EJ3V0UM00
211
CHAPTER 8 SERIAL INTERFACE FUNCTION
Bit Position
Bit Name
Function
0
SCLS
Serial Clock Source
Specifies serial clock.
0 : Specified by BRGC0 and BPRM0
1 :
φ
/2
• When SCLS = 1
φ
/2 is selected as serial clock source. In asynchronous mode, baud rate is expressed as
follows because sampling rate of x16 is used:
Baud rate = bps
Value of baud rate when typical clock is used based on above expression is as follows:
φ
33 MHz 25 MHz 20 MHz 16 MHz 12.5 MHz 10 MHz
8 MHz
5 MHz
Baud rate
1031 K
781 K
625 K
500 K
390 K
312 K
250 K
156 K
• When SCLS = 0
Baud rate generator output is selected as serial clock source. For details of baud rate
generator, refer to 8.5 Baud Rate Generator 0 to 3 (BRG0 to BRG3).
Caution
The operation of UART is not guaranteed if these registers are changed while UART is
transmitting/receiving data.
Remark
φ
: Internal system clock
Bit Position
Bit Name
Function
1
NOT
Not
Inverts the output level from TXD pin.
0 : Does not invert the output level
1 : Inverts output level
Use this function to connect an external circuit having inverted level to TXD pin.
0
EBS
Extended Bit Select
Specifies extended bit operation of transmit/receive data when no parity is specified (PS0 = 0,
PS1 = 0).
0 : Disables extended bit operation
1 : Enables extended bit operation
When extended bit operation is enabled, 1 data bit is appended as most significant bit to 8-bit
transmit/receive data, and therefore 9-bit data is communicated.
Extended bit operation is valid only when no parity is specified by ASIM0 register. If zero, even,
or odd parity is specified, specification by EBS bit is invalid, and extended bit is not appended.
φ
/2
16
Address
FFFFF0C2H
7
0
ASIM1
6
0
5
0
4
0
3
0
2
0
1
NOT
0
EBS
After reset
00H
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