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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(7)
Clocked serial interface transmission buffer registers (SOTB0 to SOTB2)
The SOTBn register is a 16-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 SOTBn register.
This register can be read/written in 16-bit units.
Figure 13-28:
Clocked Serial Interface Transmission Buffer Registers (SOTB0 to SOTB2)
Cautions: 1. Access the SOTBn register only when the 16-bit data length is set (CCL bit of
CSIMn register = 1).
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 SOTBn
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
SOTB0 SOTB15 SOTB14 SOTB13 SOTB12 SOTB11 SOTB10 SOTB9 SOTB8 SOTB7 SOTB6 SOTB5 SOTB4 SOTB3 SOTB2 SOTB1 SOTB0 FFFF FD04H 0000H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
SOTB1 SOTB15 SOTB14 SOTB13 SOTB12 SOTB11 SOTB10 SOTB9 SOTB8 SOTB7 SOTB6 SOTB5 SOTB4 SOTB3 SOTB2 SOTB1 SOTB0 FFFF FD44H 0000H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
SOTB2 SOTB15 SOTB14 SOTB13 SOTB12 SOTB11 SOTB10 SOTB9 SOTB8 SOTB7 SOTB6 SOTB5 SOTB4 SOTB3 SOTB2 SOTB1 SOTB0 FFFF FD84H 0000H
Bit Position
Bit Name
Function
15 to 0
SOTB15 to
SOTB0
Store transmit data.
Summary of Contents for mPD703128
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