User’s Manual U11969EJ3V0UM00
223
CHAPTER 8 SERIAL INTERFACE FUNCTION
Bit Position
Bit Name
Function
1, 0
CLSn1, CLSn0
Clock Source
Specifies serial clock.
CLSn1
CLSn0
Specifies Serial Clock
SCKn pin
0
0
External clock
Input
0
1
Internal clock
Specified by BPRMn register
Note 1
Output
1
0
φ
/4
Note 2
Output
1
1
φ
/2
Note 2
Output
Notes 1. For setting of BPRMn register, refer to section 8.5 Baud Rate Generator 0 to 3
(BRG0 to BRG3).
2.
φ
/4 and
φ
/2 indicate dividing signals (
φ :
internal system clock).
Remark
n = 0 to 3
Caution
Set the CLSn1 and CLSn0 bits, in the transmission/reception disable state (CTXEn bit = CRXEn
bit = 0). If these bits are set in a state other than transmission/reception disabled, normal
operation is not guaranteed.
(2) Serial I/O shift register 0 to 3 (SIO0 to SIO3)
These registers convert 8-bit serial data into parallel data, and vice versa. The actual transmitting and receiving
of data is performed by writing data to and reading data from the SIOn registers.
A shift operation is performed when CTXE = “1” or CRXE = “1”.
These registers can be read/written in 8- or 1-bit units.
Bit Position
Bit Name
Function
7 to 0
SIOn7 to
Serial I/O
SIOn0
Data is shifted in (received) or out (transmitted) from MSB or LSB side.
(n = 0 to 3)
Address
FFFFF08AH
7
SIO07
SIO0
6
SIO06
5
SIO05
4
SIO04
3
SIO03
2
SIO02
1
SIO01
0
SIO00
After reset
Undefined
Address
FFFFF09AH
After reset
Undefined
Address
FFFFF0AAH
After reset
Undefined
Address
FFFFF0BAH
After reset
Undefined
SIO17
SIO1
SIO16
SIO15
SIO14
SIO13
SIO12
SIO11
SIO10
SIO27
SIO2
SIO26
SIO25
SIO24
SIO23
SIO22
SIO21
SIO20
SIO37
SIO3
SIO36
SIO35
SIO34
SIO33
SIO32
SIO31
SIO30
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