NEC PD750008 - Manual (Page 183)

163
CHAPTER 5 PERIPHERAL HARDWARE FUNCTIONS
SIO
SCK 9 8
D2 D1 D0 SB0, SB1
ACKD
7 6
ACK
Transfer start request
Transfer start
Figure 5-63. Operation of ACKE (2/2)
(d) When ACKE = 1 period is too short
Figure 5-64. Operation of ACKD (1/2)
(a) When ACK signal is output during the ninth SCK clock
(b) When ACK signal is output after the ninth SCK clock
SCK
SB0, SB1
ACKE
The ACK signal is not
output.
When ACKE is set or cleared during this period
and ACKE = 0 at the falling edge of SCK
SIO
SCK
D2 D1 D0 SB0, SB1
ACKD
9
ACK
8 7 6
Transfer start request
Transfer start