CHAPTER 15 CLOCKED SERIAL INTERFACE 0 (CSI0)
User’s Manual U16896EJ2V0UD
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(6) Clocked serial interface initial transmit buffer registers n, nL (SOTBFn, SOTBFnL)
The SOTBFn register is a 16-bit buffer register that stores initial transmission data in the continuous transfer
mode.
The transmission operation is not started even if data is written to the SOTBFn register.
This register can be read or written in 16-bit units. However, when the lower 8 bits are used as the SOTBFnL
register, the register can be read or written in 8-bit units.
Reset sets this register to 0000H.
Caution Access the SOTBFn register and SOTBFnL register only when a 16-bit data length has been
set (CSIM0n.CCLn bit = 1), and only when an 8-bit data length has been set (CCLn bit = 0),
respectively, and only in the idle state (CSIM0n.CSOTn bit = 0). If the SOTBFn and
SOTBFnL registers are accessed during data transfer, the data cannot be guaranteed.
(a) SOTBFn register
14
SOTBFn
14
13
SOTBFn
13
12
SOTBFn
12
2
SOTBFn
2
3
SOTBFn
3
4
SOTBFn
4
5
SOTBFn
5
6
SOTBFn
6
7
SOTBFn
7
8
SOTBFn
8
9
SOTBFn
9
10
SOTBFn
10
11
SOTBFn
11
15
SOTBFn
15
1
SOTBFn
1
0
SOTBFn
0
SOTBFn
(n = 0, 1)
After reset: 0000H R/W Address: SOTBF0 FFFFFD08H, SOTBF1 FFFFFD18H
(b) SOTBFnL register
7
SOTBFn7
SOTBFnL
(n = 0, 1)
6
SOTBFn6
5
SOTBFn5
4
SOTBFn4
3
SOTBFn3
2
SOTBFn2
1
SOTBFn1
0
SOTBFn0
After reset: 00H R/W Address: SOTBF0L FFFFFD08H, SOTBF1L FFFFFD18H