CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
351
(7) Clocked serial interface transmit buffer registers 5, 6 (SOTB5, SOTB6)
The SOTBn register is a 16-bit buffer register that stores transmit data.
When the transmit/receive mode is set (TRMDn bit of CSIMn register = 1), transmission is started by writing
data to the SOTBn register (n = 5, 6).
SOTBn is set by a 16-bit memory manipulation instruction.
RESET input sets these registers to 0000H.
After reset:
0000H
R/W
Address: FFFFF248H, FFFFF268H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SOTBn
SOTB
n15
SOTB
n14
SOTB
n13
SOTB
n12
SOTB
n11
SOTB
n10
SOTB
n9
SOTB
n8
SOTB
n7
SOTB
n6
SOTB
n5
SOTB
n4
SOTB
n3
SOTB
n2
SOTB
n1
SOTB
n0
(n = 5, 6)
Cautions 1. Access the SOTBn register only when a data length of 16 bits is set (CCLn bit of CSIMn
register = 1).
2. When the single transfer mode is set (AUTOn bit of CSIMn register = 0), perform access
only in the idle state (CSOTn bit of CSIMn register = 0). If the SOTBn register is
accessed during data transfer, the data cannot be guaranteed.
(8) Clocked serial interface transmit buffer registers L5, L6 (SOTBL5, SOTBL6)
The SOTBLn register is an 8-bit buffer register that stores transmit data.
When the transmit/receive mode is set (TRMDn bit of CSIMn register = 1), transmission is started by writing
data to the SOTBLn register (n = 5, 6).
SOTBLn is set by an 8-bit or 1-bit memory manipulation instruction.
RESET input sets these registers to 00H.
The SOTBLn register is the same as the lower bytes of the SOTBn register.
After reset:
00H
R/W
Address: FFFFF24AH, FFFFF26AH
7
6
5
4
3
2
1
0
SOTBLn
SOTBn7
SOTBn6
SOTBn5
SOTBn4
SOTBn3
SOTBn2
SOTBn1
SOTBn0
(n = 5, 6)
Cautions 1. Access the SOTBLn register only when a data length of 8 bits has been set (CCLn bit of
CSIMn register = 0).
2. When the single transfer mode is set (AUTOn 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.