CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
289
Bit Position
Bit Name
Function
2
SLn
Stop Bit Length
Specifies the stop bit length.
0: 1 bit
1: 2 bits
Serial Clock Source
Specifies the serial clock.
SCLSn1
SCLSn0
Serial Clock
0
0
Baud rate generator output
0
1
φ
/2 (
×
16 sampling rate)
1
0
φ
/2 (
×
8 sampling rate)
1
1
φ
/2 (
×
4 sampling rate)
•
In the case of SCLSn1, SCLSn0 = 00
φ
/2 is selected as the serial clock source. (
φ
: internal system clock). In the
asynchronous mode,
×
16,
×
8 and
×
4 sampling rates are used, so the baud rate is
expressed by the following formula.
Baud rate =
bps
rate
sampling
2
/
φ
Based on the formula above, the baud rate value in the case where a representative
clock is used is shown below.
Sampling Rate
Note
Internal
System Clock (
φ
)
×
16
(01)
×
8
(10)
×
4
(11)
40 MHz
1,250 K
2,500 K
33 MHz
1,031 K
2,062 K
4,125 K
25 MHz
781 K
1,562 K
3,125 K
20 MHz
625 K
1,250 K
2,500 K
16 MHz
500 K
1,000 K
2,000 K
12.5 MHz
390 K
781 K
1,562 K
10 MHz
312 K
625 K
1,250 K
8 MHz
250 K
500 K
1,000 K
5 MHz
156 K
312 K
625 K
1, 0
SCLSn1,
SCLSn0
Note Values in ( ) are the set values for the SCLSn1 and SCLSn0 bits
•
If SCLSn1, SCLSn0 = 00
The baud rate generator output is selected as the serial clock source. For details
concerning the baud rate generator, refer to 10.4 Dedicated Baud Rate Generators
0 to 2 (BRG0 to BRG2).
Caution UARTn operation is not guaranteed if this register is changed during UARTn transmission or
reception. Furthermore, if this register is changed during UARTn transmission or reception, a
transmission complete interrupt (INTSTn) is generated during transmission, and a reception
complete interrupt (INTSRn) is generated during reception.
Remark
n = 0, 1
Содержание V850E/MS1 UPD703100
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