CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
495
(8) Clocked serial interface transmission buffer registers L0, L1 (SOTBL0, SOTBL1)
The SOTBLn register is an 8-bit buffer register that stores transmit data (n = 0, 1).
When the transmission/reception mode is set (TRMDn bit of CSIMn register = 1), the transmission operation
is started by writing data to the SOTBLn register.
These registers can be read/written in 8-bit or 1-bit units.
The SOTBLn register is the same as the lower bytes of the SOTBn register.
Cautions 1. Access the SOTBLn register only when the 8-bit data length has been set (CCL bit of
CSIMn register = 0).
2. When the single transfer mode is set (AUTO bit of CSIMn register = 0), perform access
only in the idle state (CSOTn bit of CSIMn register = 0). If the SOTBLn register is
accessed during data transfer, the data cannot be guaranteed.
7
SOTB7
SOTBL0
6
SOTB6
5
SOTB5
4
SOTB4
3
SOTB3
2
SOTB2
1
SOTB1
0
SOTB0
Address
FFFFF904H
Initial value
00H
7
SOTB7
SOTBL1
6
SOTB6
5
SOTB5
4
SOTB4
3
SOTB3
2
SOTB2
1
SOTB1
0
SOTB0
Address
FFFFF914H
Initial value
00H
Bit Position
Bit Name
Function
7 to 0
SOTB7 to
SOTB0
Stores transmit data.
