NEC UPD703116 User Manual page 488

(8) Clocked serial interface transmit buffer registers L0, L1 (SOTBL0, SOTBL1)
The SOTBLn register is an 8-bit buffer register that stores transmit data (n = 0, 1).
When the transmission/reception mode is set (TRMDn 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 or 1-bit units.
The SOTBLn register is the same as the lower bytes of the SOTBn register.
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 (CSOTn bit of CSIMn register = 0). If the SOTBLn register is
accessed during data transfer, the data cannot be guaranteed.
7
SOTBL0 SOTB7 SOTB6
7
SOTBL1 SOTB7 SOTB6
Bit position Bit name
7 to 0 SOTB7 to
SOTB0
488
CHAPTER 10 SERIAL INTERFACE FUNCTION
6 5 4
SOTB5 SOTB4 SOTB3
6 5 4
SOTB5 SOTB4 SOTB3
Stores transmit data.
User's Manual U14492EJ5V0UD
3 2 1
SOTB2 SOTB1 SOTB0
3 2 1
SOTB2 SOTB1 SOTB0
Function
0 Address Initial value
FFFFF904H 00H
0 Address Initial value
FFFFF914H 00H