TOIM3000/3232

Preliminary Information

TELEFUNKEN Semiconductors

Rev. A4, 26-Mar-96

7 (9)

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 pro-

gramming

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 baud 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 con-

trol 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 time pulses.

Z = 0 sets to 115.2 kbit/s. Then 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 re-

program a new data rate by re-start-

ing from step 3. The UART also

must be set to the correct data rate

***).

***)

For programming the UART, refer to the National Semiconductor’s data sheet of PC 16550 UART.