163
CHAPTER 5 PERIPHERAL HARDWARE FUNCTIONS
SIO
SCK 98
D2 D1 D0 SB0, SB1
ACKD
76
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
876
Transfer start request
Transfer start