CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
352
(9) Clocked serial interface initial transmit buffer registers 5, 6 (SOTBF5, SOTBF6)
The SOTBFn register is a 16-bit buffer register that stores the initial transmit data in the repeat transfer mode.
Transmission is not started even if data is written to the SOTBFn register (n = 5, 6).
SOTBFn can be set by a 16-bit memory manipulation instruction.
RESET input sets these registers to 0000H.
After reset:
0000H
R/W
Address: FFFFF250H, FFFFF270H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SOTBFn
SOTBF
n15
SOTBF
n14
SOTBF
n13
SOTBF
n12
SOTBF
n11
SOTBF
n10
SOTBF
n9
SOTBF
n8
SOTBF
n7
SOTBF
n6
SOTBF
n5
SOTBF
n4
SOTBF
n3
SOTBF
n2
SOTBF
n1
SOTBF
n0
(n = 5, 6)
Caution
Access the SOTBFn register only when a data length of 16 bits has been set (CCLn bit of
CSIMn register = 1), and only in the idle state (CSOTn bit of CSIMn register = 0). If the
SOTBFn register is accessed during data transfer, the data cannot be guaranteed.
(10) Clocked serial interface initial transmit buffer registers L5, L6 (SOTBFL5, SOTBFL6)
The SOTBFLn register is an 8-bit buffer register that stores the initial transmit data in the repeat transfer mode.
Transmission is not started even if data is written to the SOTBFLn register (n = 5, 6).
SOTBFLn is set by an 8-bit or 1-bit memory manipulation instruction.
RESET input sets these registers to 00H.
The SOTBFLn register is the same as the lower bytes of the SOTBFn register.
After reset:
00H
R/W
Address: FFFFF252H, FFFFF272H
7
6
5
4
3
2
1
0
SOTBFLn
SOTBFn7
SOTBFn6
SOTBFn5
SOTBFn4
SOTBFn3
SOTBFn2
SOTBFn1
SOTBFn0
(n = 5, 6)
Caution
Access the SOTBFLn register only when a data length of 8 bits has been set (CCLn bit of
CSIMn register = 0), and only in the idle state (CSOTn bit of CSIMn register = 0). If the
SOTBFLn register is accessed during data transfer, the data cannot be guaranteed.