CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U15195EJ5V0UD
490
(11) Serial I/O shift registers 0, 1 (SIO0, SIO1)
The SIOn register is a 16-bit shift register that converts parallel data into serial data (n = 0, 1).
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 CSICAEn bit of the CSIMn
register.
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 (CSOTn bit of CSIMn register = 0). If the
SIOn register is accessed during data transfer, the data cannot be guaranteed.
14
SIO14
13
SIO13
12
SIO12
2
SIO2
3
SIO3
4
SIO4
5
SIO5
6
SIO6
7
SIO7
8
SIO8
9
SIO9
10
SIO10
11
SIO11
15
SIO15
1
SIO1
0
SIO0
SIO0
Address
FFFFF90AH
After reset
0000H
14
SIO14
13
SIO13
12
SIO12
2
SIO2
3
SIO3
4
SIO4
5
SIO5
6
SIO6
7
SIO7
8
SIO8
9
SIO9
10
SIO10
11
SIO11
15
SIO15
1
SIO1
0
SIO0
SIO1
Address
FFFFF91AH
After reset
0000H
Bit position
Bit name
Function
15 to 0
SIO15 to
SIO0
Data is shifted in (reception) or shifted out (transmission) from the MSB or LSB
side.