UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 94

• Manufacturer Part Number: UPD75238GJ
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC [NEC]

94
(a) When ACKE = 1 at time of transfer operation completion
(b) When ACKE is set after transfer operation completion
(c) When ACKE = 0 at time of transfer operation completion
(d) When ACKE = 1 period is too short
SB0/SB1
SB0/SB1
SB0/SB1
SB0/SB1
ACKE
ACKE
ACKE
ACKE
SCK0
SCK0
SCK0
SCK0
6
D2
7
D1
1
1
D7
D7
8
D0
2
2
Fig. 4-46 Operation of ACKE
D6
D6
9
D2
D2
7
7
D1
D1
When ACKE is set or cleared during this period,
and ACKE = 0 at the falling edge of SCK0
When ACKE is set during this period and ACKE = 1 at
the falling edge of the next SCK0
8
8
D0
D0
ACK
9
ACK
9
When ACKE = 1 at this point
When ACKE = 0 at this point
The ACK signal is output
during the first clock cycle
immediately after ACKT is set.
The ACK signal is not
output
The ACK signal is output
during the ninth clock
cycle
The ACK signal is not
output
PD75238