ZEN2044F Zenic, ZEN2044F Datasheet - Page 10

• Manufacturer Part Number: ZEN2044F
• Description: 33MHz Up/down Counter
• Manufacturer: Zenic

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4-5. Detection of abnormal input
transition state(shown in Fig.1 with
flag(D7 bit of the status register) is set. Some causes of the abnormal transition state are as follows:
(1) The frequencies of phase shifted pulse inputs exceed the one fourth of the system clock frequency. In
(2) When the line-noises are sampled, the
The
When an abnormal transition state(shown in Fig.1 with
this case, the transition state cannot be sampled correctly.
ZEN2044F
01
Fig.1 State transitions and an example of detecting the abnormal input
AB
11
00
has the function to check whether the phase-shifted pulse inputs show a correct
10
B
A
0
0
ZEN2044F
1
0
mark) or not.
- 10 -
1
1
0
1
detects the abnormal transition.
0
0
AI(00->11)
1
1
1 0
1 1
mark) occurs, the Abnormal Input
(
Z2044G00 ZENIC INC.
ZEN2044F
)