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A8351601L-40 Datasheet(PDF) 20 Page - AMIC Technology

Part No. A8351601L-40
Description  Bar Code Reader
Download  44 Pages
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Manufacturer  AMICC [AMIC Technology]
Direct Link  http://www.amictechnology.com
Logo AMICC - AMIC Technology

A8351601L-40 Datasheet(HTML) 20 Page - AMIC Technology

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A8351601 Series
(July, 2002, Version 1.0)
19
AMIC Technology, Inc.
Timer/Counter 2 Set-Up
Except for the baud rate generator mode, the values given
for T2C0N do not include the setting of the TR2 bit.
Therefore, bit TR2 must be set separately to turn the
Timer on.
Table 7. Timer/Counter 2 Used as a Timer
T2CON
Mode
Internal
Control
(1)
External
Control
(2)
16-Bit Auto-Reload
00H
08H
16-Bit Capture
01H
09H
Baud Rate Generator Receive
and Transmit Same Baud Rate
34H
36H
Receive Only
24H
26H
Transmit Only
14H
16H
Table 8. Timer/Counter 2 Used as a Counter
T2CON
Mode
Internal
Control
(1)
External
Control
(2)
16-Bit Auto-Reload
02H
0AH
16-Bit Capture
03H
0BH
Notes:
1. Capture/Reload occurs only on Timer/Counter overflow.
2. Capture/Reload occurs on Timer/Counter overflow and a
1 to 0 transition on T2EX (P1.1) pin except when Timer 2
is used in the baud rate generating mode.
Serial Interface
The Serial port is full duplex, which means it can transmit
and receive simultaneously. It is also receive-buffered,
which means it can begin receiving a second byte before a
previously received byte has been read from the receive
register. (However, if the first byte still has not been read
when reception of the second byte is complete, one of the
bytes will be lost.) The serial port receive and transmit
registers are both accessed at Special Function Register
SBUF. Writing to SBUF loads the transmit register, and
reading SBUF accesses a physically separate receive
register.
The serial port can operate in the following four modes:
Mode 0:
Serial data enters and exits through RXD. TXD outputs the
shift clock. Eight data bits are transmitted/received, with
the LSB first. The baud rate is fixed at 1/12 the oscillator
frequency (see Figure 9).
Mode 1:
Ten bits are transmitted (through TXD) or received
(through RXD): a start bit (0), eight data bits (LSB first),
and a stop bit (1). On receive, the stop bit goes into RB8 in
Special Function Register SCON. The baud rate is variable
(see Figure 10).
Mode 2:
Eleven bits are transmitted (through TXD) or received
(through RXD): a start bit (0), eight data bits (LSB first), a
programmable ninth data bit, and a stop bit (1). On
transmit, the ninth data bit (TB8 in SCON) can be assigned
the value of 0 or 1. Or, for example, the parity bit (P, in the
PSW) can be moved into TB8. On receive, the ninth data
bit goes into RB8 in Special Function Register SCON,
while
the
stop
bit
is
ignored.
The
baud
rate
is
programmable to either 1/32 or 1/64 the oscillator
frequency (see Figure 11).
Mode 3:
Eleven bits are transmitted (through TXD) or received
(through RXD): a start bit (0), eight data bits (LSB first), a
programmable ninth data bit, and a stop bit (1). In fact,
Mode 3 is the same as Mode 2 in all respects except the
baud rate, which is variable in Mode 3 (see Figure 12).
In all four modes, transmission is initiated by any
instruction that uses SBUF as a destination register.
Reception is initiated in Mode 0 by the condition RI = 0 and
REN = 1. Reception is initiated in the other modes by the
incoming start bit if REN = 1.


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