CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
302
Bit Position
Bit Name
Function
Clock Source
Specifies the serial clock.
CLSn1
CLSn0
Serial Clock Specification
SCK Pin
0
0
External clock
Input
0
1
Specified by the BPRMm
register
Note 1
Output
1
0
φ
/4
Note 2
Output
1
1
Internal
clock
φ
/2
Note 2
Output
1, 0
CLSn1,
CLSn0
Notes 1.
Refer to 10.4 Dedicated Baud Rate Generators 0 to 2 (BRG0 to BRG2)
concerning setting of the BPRMm registers (m = 0 to 2).
2.
φ
/4 and
φ
/2 are divider signals (
φ
: Internal system clock).
Cautions 1. When setting the CLSn1 and CLSn0 bits, do so in the transmission/reception disabled
(CTXEn bit = CRXEn bit = 0) state. If the CLSn1 and CLSn0 bits are set in a state other
than transmission/reception disabled, subsequent operation may not be normal.
2. If the values set in bits 0 to 2 of these registers are changed while CSIn is transmitting or
receiving, the operation of CSIn is not guaranteed.
Remark
n = 0 to 3
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