ZEN2044F Zenic, ZEN2044F Datasheet - Page 14

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

www.DataSheet4U.com
5-4. Command register format(Mode 1)
enabling, disabling and reset. AI reset command resets EXTB
discrimination circuit.
register B can be accessed in Mode 1 only and the D0 of the status register shows the result of the
comparator B. EXTA
INTEQA ). EXTB
Above three hold outputs can be used for an interrupt request. And they have three functions,
Only when the system mode is Mode 1, the command group of Mode 1 becomes effective. The reference
EQA
EQB
EQA +EQB
INTEQA
INTEQB
INTAI
D7
0
0
1
1
1
Note 1)
Note 2)
*
*
*
*
*
*
*
*
*
*
*
*
"*" stands for "don't care".
Command ID indicates system mode select or Mode 1 command.
n
n
n
n
D6
n
*
*
*
*
*
*
*
*
0
0
1
1
*
*
*
0
*
is the result of comparing the reference register A to the up/down counter.
is the result of comparing the reference register B to the up/down counter.
n
n
is holding low once an abnormal transition state is detected.
D5
is the hold output of EQA .
is the hold output of EQB .
n
0
1
0
1
0
*
*
*
*
*
*
*
*
*
*
*
*
is the logical sum(OR) of EQA
n
D4
n
*
*
*
*
*
*
*
*
*
*
*
*
0
1
0
1
1
can be programmed to output one of three signals(EQB ,INTEQB
can be programmed to output one of three signals(EQA ,EQA
D3
Table 8 Format of command register
0
0
1
1
1
*
*
*
*
*
*
*
*
*
*
*
*
D2
0
1
0
1
*
*
*
*
*
*
*
*
*
*
*
*
*
D1
*
*
*
*
*
0
0
1
*
*
*
*
*
*
*
*
*
n
n
D0
0
1
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
- 14 -
Selecting up/down counter[default]
Selecting reference reg. A
Selecting preload reg.(in Mode 0)
Selecting preload reg.(in Mode 1)
Selecting reference reg. B(in Mode 1)
Selecting low byte[default]
Selecting middle byte
Selecting high byte
Keeping current setting as to Z phase input
Setting Z phase pulse ineffective
Setting only next Z phase pulse effective
Setting every Z phase pulse effective
No operation as to Load/Latch
Latching the count value
Loading the preload value
Command ID
Inhibit(except Command ID)
n
and EQB .
n
n
output and initializes the phase
Operation
n
n
(
Z2044G00 ZENIC INC.
n
n
+ EQB
ZEN2044F
ZEN2044F
)
or INTAI ).
n
or
n