NEC UPD703116 User Manual page 487

(7) Clocked serial interface transmit buffer registers 0, 1 (SOTB0, SOTB1)
The SOTBn register is a 16-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 SOTBn register.
These registers can be read/written in 16-bit units.
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 (CSOTn bit of CSIMn register = 0).
accessed during data transfer, the data cannot be guaranteed.
15 14 13 12
SOTB0 SOTB SOTB SOTB SOTB
15 14 13 12
15 14 13 12
SOTB1 SOTB SOTB SOTB SOTB
15 14 13 12
Bit position Bit name
15 to 0 SOTB15 to
SOTB0
CHAPTER 10 SERIAL INTERFACE FUNCTION
11 10 9 8 7 6
SOTB SOTB SOTB SOTB SOTB SOTB
11 10 9 8 7 6
11 10 9 8 7 6
SOTB SOTB SOTB SOTB SOTB SOTB
11 10 9 8 7 6
Stores transmit data.
User's Manual U14492EJ5V0UD
5 4 3 2 1 0
SOTB SOTB SOTB SOTB SOTB SOTB
5 4 3 2 1 0
5 4 3 2 1 0
SOTB SOTB SOTB SOTB SOTB SOTB
5 4 3 2 1 0
Function
If the SOTBn register is
Address Initial value
FFFFF904H 0000H
Address Initial value
FFFFF914H 0000H
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