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A8351601 Datasheet(PDF) 6 Page - AMIC Technology

Part No. A8351601
Description  Bar Code Reader
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Maker  AMICC [AMIC Technology]
Homepage  http://www.amictechnology.com
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A8351601 Datasheet(HTML) 6 Page - AMIC Technology

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A8351601 Series
(July, 2002, Version 1.0)
5
AMIC Technology, Inc.
Pin Description (continued)
Pin No.
Symbol
P-DIP
PLCC
QFP
I/O
Description
P3.0-P3.7
10-17
11,13-19
5, 7-13
I/O
Port 3: Port 3 is an 8-bit bidirectional I/O port with internal
pullups. Port 3 pins that have 1s written to them are pulled
high by the internal pullups and can be used as inputs. As
inputs, Port 3 pins that are externally pulled low will source
current
because
of
the
internal
pullups.
(See
DC
Characteristics: IIL).
Port 3 also serves the special features of the A8351601, as
listed below:
10
11
5
I
RxD (P3.0): Serial input port.
11
13
7
O
TxD (P3.1): Serial output port.
12
14
8
I
INT0 (P3.2): External interrupt 0.
13
15
9
I
INT1 (P3.3): External interrupt 1.
14
16
10
I
T0 (P3.4): Timer 0 external input.
15
17
11
I
T1 (P3.5): Timer 1 external input.
16
18
12
O
WR (P3.6): External data memory write strobe.
17
19
13
O
RD (P3.7): External data memory read strobe.
PSEN
29
32
26
O
Program Store Enable: The read strobe to external
program memory. When the device is executing code from
the external program memory, PSEN is activated twice
each machine cycle except that two PSEN actives are
skipped during each access to external data memory.
PSEN is not activated during fetches from internal program
memory.
RST
9
10
4
I
Reset: A high on this pin for two machine cycles while the
oscillator is running, resets the device.
PWM1
1
39
O
Pulse width modulation 1 output.
PWM2
12
6
O
Pulse width modulation 2 output.
PWM3
23
17
O
(D2, D1, D0) controlled the delay time of PWM3 from 4 CLK
to 11 CLK after PWM1 change.
PWM4
34
28
O
PWM1.7: 1 is PWM3/4096, 75% duty (3072 PWM3 cycle
high, 1024 PWM3 cycle low)
PWM1.7: 0 is PWM3/1024, 67% duty (2048 PWM3 cycle
high, 1024 PWM3 cycle low)
XTAL1
19
21
15
I
Crystal 1: Input to the inverting oscillator and input to the
internal clock generator circuits.
XTAL2
18
20
14
O
Crystal 2: Output from the inverting oscillator.
GND
20
22
16
I
Ground: 0V reference.
VCC
40
44
38
I
Power Supply: This is the power supply voltage for
operation.


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