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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(8)
Clocked serial interface transmission buffer registers Low (SOTBL0 to SOTBL2)
The SOTBLn register is an 8-bit buffer register that stores transmit data (n = 0 to 2).
When the transmission/reception mode is set (TRMD 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 units.
The SOTBLn register is the same as the lower bytes of the SOTBn register.
Figure 13-29:
Clocked Serial Interface Transmission Buffer Registers Low
(SOTBL0 to SOTBL2)
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 (CSOT bit of CSIMn register = 0). If the SOTBLn
register is accessed during data transfer, the data cannot be guaranteed.
7
6
5
4
3
2
1
0
Address
Initial
value
SOTBL0
SOTB7
SOTB6
SOTB5
SOTB4
SOTB3
SOTB2
SOTB1
SOTB0
FFFF FD04H
00H
SOTBL1
SOTB7
SOTB6
SOTB5
SOTB4
SOTB3
SOTB2
SOTB1
SOTB0
FFFF FD44H
00H
SOTBL2
SOTB7
SOTB6
SOTB5
SOTB4
SOTB3
SOTB2
SOTB1
SOTB0
FFFF FD84H
00H
Bit Position
Bit Name
Function
7 to 0
SOTB7 to
SOTB0
Store transmit data.
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