ZEN2044F Zenic, ZEN2044F Datasheet - Page 3

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

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3. Pin description
EXTA0
EXTA1
EXTA2
EXTA3
CLK
RESET
AD/CE0
AD/CE1
AD/CE2
AD/CE3
DRCTCE
C/D
RD
WR
LD0
LD1
LD2
LD3
LT0
LT1
LT2
LT3
D0
D1
D2
D3
D4
D5
D6
D7
EXTB0
EXTB1
EXTB2
EXTB3
Name
No.
53
71
86
67
16
26
27
28
29
30
25
34
33
55
73
88
56
74
89
36
37
38
39
42
43
44
45
52
70
85
6
5
8
9
I/O
I/O
I/O
O
I
I
I
I
I
I
I
I
I
The function of this output depends on the command mode. In Mode
0, EXTA
following three signals can be selected:
The CLK synchronizes the internal circuit operation.
The RESET initializes the up/down counter, the phase
discrimination circuit, the command register and the status register.
The function of these pins depends on the DRCTCE. If DRCTCE="1",
they are all treated as signals for enabling the channel directly. If
DRCTCE="0",AD/CE3 and AD/CE2 are the chip enable pins and
AD/CE1 and AD/CE0 are used to select the channnel.
The DRCTCE specifies the mode of the channel select.
The C/D defines the type of the data transfered between the CPU
and the ZEN2044F(command or value). This pin is usually connected
with LSB of the address lines.
The RD is the strobe signal of the read operation.
The WR is the strobe signal of the write operation.
The LD
register to the up/down counter.
The LT
register.
These pins are connected with CPU data bus.
In Mode 0, EXTB
value can be read from the status register. In Mode 1, EXTB
programable output. One of the following three signals can be
selected:
-The equal signal A(EQA ).
-The logical sum(EQA +EQB ) of the equal signal A(EQA ) and
the equal signal B(EQB ).
-The hold equal signal A(INTEQA ).
-The equal signal B(EQB ) n
-The signal that indicates detecting an abnormal input(INTAI ) n
-The hold equal signal B(INTEQB ) n
n
n
n
stores the 32bit data of the up/down counter into the latch
transmits the 32bit data which is stored in the preload
outputs the equal signal A(EQA ). In Mode 1, one of the
Table 1
- 3 -
n
is used as a general purpose input U of which
n
n
n
Function
n
n
n
(
Z2044G00 ZENIC INC.
ZEN2044F
)
n
n
is a