NEC 78K0 User Manual page 570

CHAPTER 31 ELECTRICAL SPECIFICATIONS ((A1) GRADE PRODUCTS)
3-wire serial I/O mode with automatic transmit/receive function:
SOA0 D2
SIA0 D2
t
SIK3, 4
t
KSO3, 4
SCKA0
t
KL3, 4
STB0
3-wire serial I/O mode with automatic transmit/receive function (busy processing):
SCKA0 7
BUSY0
(active-high)
Note The signal is not actually driven low here; it is shown as such to indicate the timing.
570
D1 D0
D1 D0
t
KSI3, 4
t
KH3, 4
t
F4
t
R4
t t
KCY3, 4
Note
8 9
User's Manual U15947EJ2V0UD
t
SBD SBW
Note
10
t
BYS
*
D7
Note
10+n 1
t t
BYH SPS
D7