NEC UPD703116 User Manual page 494

(a) In transmission/reception mode, data length: 8 bits, transfer direction: MSB first, no interrupt delay,
single transfer mode, operation mode: CKP bit = 0, DAP bit = 0
SCKn
(I/O)
SOn
(output)
SIn
(input)
Reg_R/W
SOTBLn
register
SIOLn
register
SIRBLn
register
CSOTn
bit
INTCSIn
interrupt
Remarks 1. n = 0, 1
2. Reg_R/W:
494
CHAPTER 10 SERIAL INTERFACE FUNCTION
Figure 10-26. Timing Chart in Single Transfer Mode (1/2)
0 1 0
1 0 1
Write 55H to SOTBLn register
ABH 56H
Internal signal. This signal indicates that receive data buffer register (SIRBn/
SIRBLn) read or transmit data buffer register (SOTBn/SOTBLn) write was
performed.
User's Manual U14492EJ5V0UD
1 0 1
0 1 0
55H (transmit data)
ADH 5AH B5H
0 1 (55H)
1 0 (AAH)
6AH D5H AAH
AAH