CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
303
(2) Serial I/O shift registers 0 to 3 (SIO0 to SIO3)
These registers convert 8-bit serial data to 8-bit parallel data and convert 8-bit parallel data to 8-bit serial data.
The actual transmit/receive operation is controlled by reading from or writing to the SIOn registers.
Shift operation is performed when CTXEn = 1 or CRXEn = 1.
These registers can be read/written in 8- or 1-bit units.
Address
FFFFF08AH
7
SIO07
SIO0
6
SIO06
5
SIO05
4
SIO04
3
SIO03
2
SIO02
1
SIO01
0
SIO00
After reset
Undefined
FFFFF09AH
SIO17
SIO1
SIO16
SIO15
SIO14
SIO13
SIO12
SIO11
SIO10
Undefined
FFFFF0AAH
SIO27
SIO2
SIO26
SIO25
SIO24
SIO23
SIO22
SIO21
SIO20
Undefined
FFFFF0BAH
SIO37
SIO3
SIO36
SIO35
SIO34
SIO33
SIO32
SIO31
SIO30
Undefined
Bit Position
Bit Name
Function
7 to 0
SIOn7 to
SIOn0
(n = 0 to 3)
Serial I/O
Data shift in (receiving) or shift out (transmitting) from the MSB or from the LSB.
Caution CSIn operation is not guaranteed if this register is changed during CSIn operation.
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