CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
499
(12) Serial I/O shift registers L0, L1 (SIOL0, SIOL1)
The SIOLn register is an 8-bit shift register that converts parallel data into serial data (n = 0, 1).
The transfer operation is not started even if the SIOLn register is read.
These registers are read-only in 8-bit or 1-bit units.
In addition to reset input, this register can also be initialized by clearing (0) the CSICAEn bit of the CSIMn
register.
The SIOLn register is the same as the lower bytes of the SIOn register.
Caution
Read 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 (CSOTn bit of CSIMn register = 0). If the SIOLn
register is read during data transfer, the data cannot be guaranteed.
7
SIO7
SIOL0
6
SIO6
5
SIO5
4
SIO4
3
SIO3
2
SIO2
1
SIO1
0
SIO0
7
SIO7
6
SIO6
5
SIO5
4
SIO4
3
SIO3
2
SIO2
1
SIO1
0
SIO0
Address
FFFFF90AH
Initial value
00H
SIOL1
Address
FFFFF91AH
Initial value
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.