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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(12) Serial I/O shift registers Low (SIOL0 to SIOL2)
The SIOLn register is an 8-bit shift register that converts parallel data into serial data (n = 0 to 2).
The transfer operation is not started even if the SIOLn register is read.
These registers are read-only, in 8-bit units.
In addition to reset input, this register can also be initialized by clearing (0) the CSIE bit of the
CSIMn register.
The SIOLn register is the same as the lower bytes of the SIOn register.
Figure 13-33:
Serial I/O Shift Registers Low (SIOL0 to SIOL2)
Caution:
Access the SIOLn register only when the 8-bit data length has been set (CCL bit of
CSIMn register = 0), and only in the idle state (CSOT bit of CSIMn register = 0). If the
SIOLn register is accessed during data transfer, the data cannot be guaranteed.
7
6
5
4
3
2
1
0
Address
Initial
value
SIOL0
SIO7
SIO6
SIO5
SIO4
SIO3
SIO2
SIO1
SIO0
FFFF FD0AH
00H
SIOL1
SIO7
SIO6
SIO5
SIO4
SIO3
SIO2
SIO1
SIO0
FFFF FD4AH
00H
SIOL2
SIO7
SIO6
SIO5
SIO4
SIO3
SIO2
SIO1
SIO0
FFFF FD8AH
00H
Bit Position
Bit Name
Function
7 to 0
SIO7 to
SIO0
Data is shifted in (reception) or shifted out (transmission) from the MSB or
LSB side.
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