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TOIM3232 Datasheet(PDF) 4 Page - Vishay Telefunken

Part No. TOIM3232
Description  High-Performance gate array package using dual metal layer CMOS technology
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Maker  TFUNK [Vishay Telefunken]
Homepage  http://www.vishay.com
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TOIM3232
Vishay Telefunken
Not for new designs
Rev. A1.1, 02-Apr-01
4 (9)
www.vishay.com
Document Number 82521
Software for the TOIM3232
The control word is composed of two characters, written in hexadecimal, in format: YZ.
UART Programming
For proper operation, the RS232 must be programmed
to send a START bit plus an 8 bit data word, YZ and
no STOP bit for every word sent. The transfer rate for
programming must be identical with the formerly
programmed
data
rate,
or
after
resetting
the
TOIM3232, the default rate of 9600 bit/s is used.
Software algorithm
Step
RESET
BR/D
RD_UART TD_UART
RD_IR
TD_IR
Comments
1
HIGH
X
X
X
X
X
Resets all internal registers. Resets
IrDA default data rate of 9600 bit/s.
2
LOW
X
X
X
X
X
Wait at least 7
ms.
3
LOW
HIGH
X
X
X
X
Wait at least 7
ms.
The TOIM3232 now enters the
Control Word (programming) mode.
4
LOW
HIGH
YZ
with Y = 1
for
1.627
ms
Y = 0
for 3/16 bit
length
X
X
X
Sending the Control Word YZ.
Send ‘1Z’ if 1.627
ms pulses are
used. Otherwise send ‘0Z’ if 3/16 bit
pulses are used. ‘Y6’ keeps the 9.6
kbit/s data rate, whereas the ’0Z’
selects the 3/16 bit length pulses.
Z = 0 sets to 115.2 kbit/s. Wait at
least 1
ms for hold-time.
5
LOW
LOW
DATA
DATA
DATA
DATA
Data communication between the
TOIM3232 and the RS232 port has
been established by BR/D LOW.
The TOIM3232 now enters the data
transmission mode. Both RESET
and BR/D must be kept LOW (‘0’)
during data mode. Software can
reprogram a new data rate by
restarting from step 3.
The UART also must be set to the
correct data rate *).
*)
For programming the UART, refer to e.g., National Semiconductor’s data sheet of PC 16550 UART.




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