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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(11) Serial I/O shift registers (SIO0 to SIO2)
The SIOn register is a 16-bit shift register that converts parallel data into serial data (n = 0 to 2).
The transfer operation is not started even if the SIOn register is read.
These registers are read-only, in 16-bit units.
In addition to reset input, this register can also be initialized by clearing (0) the CSIE bit of the
CSIMn register.
Figure 13-32:
Serial I/O Shift Registers (SIO0 to SIO2)
Caution:
Access the SIOn register only when the 16-bit data length has been set (CCL bit of
CSIMn register = 1), and only in the idle state (CSOT bit of CSIMn register = 0). If the
SIOn register is accessed during data transfer, the data cannot be guaranteed.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
SIO0 SIO15 SIO14 SIO13 SIO12 SIO11 SIO10 SIO9 SIO8 SIO7 SIO6 SIO5 SIO4 SIO3 SIO2 SIO1 SIO0 FFFF FD0AH 0000H
SIO1 SIO15 SIO14 SIO13 SIO12 SIO11 SIO10 SIO9 SIO8 SIO7 SIO6 SIO5 SIO4 SIO3 SIO2 SIO1 SIO0 FFFF FD4AH 0000H
SIO2 SIO15 SIO14 SIO13 SIO12 SIO11 SIO10 SIO9 SIO8 SIO7 SIO6 SIO5 SIO4 SIO3 SIO2 SIO1 SIO0 FFFF FD8AH 0000H
Bit Position
Bit Name
Function
15-0
SIO15 to
SIO0
Data is shifted in (reception) or shifted out (transmission) from the MSB or
LSB side.
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