UPD75518 NEC, UPD75518 Datasheet - Page 98
UPD75518
Manufacturer Part Number
UPD75518
Description
4 BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC
Datasheet
1.UPD75518.pdf
(180 pages)
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98
(a) When ACKE = 1 at time of transfer completion
(b) When ACKE is set after transfer completion
(c) When ACKE = 0 at time of transfer completion
(d) When ACKE = 1 period is too short
SB0/SB1
SB0/SB1
SB0/SB1
SB0/SB1
ACKE
ACKE
SCK0
SCK0
ACKE
SCK0
ACKE
SCK0
6
D2
D2
7
D1
D1
1
1
D7
D7
8
D0
D0
2
Fig. 4-41 Operation of ACKE
2
D6
D6
9
D2
D2
7
7
When ACKE is set during this period and ACKE = 1 at
the falling edge of the next SCK0
D1
When ACKE is set or cleared during this period
and ACKE = 0 at the falling edge of SCK0
D1
8
8
D0
D0
ACK
9
9
ACK
When ACKE = 1 at this point
When ACKE = 0 at this point
The ACK signal is output
during the first clock cycle
immediately after ACKE is set.
The ACK signal is not
output.
The ACK signal is output
during the ninth clock
cycle.
The ACK signal is not
output.
PD75518(A)
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