TSSIO16E ATMEL Corporation, TSSIO16E Datasheet - Page 5

• Manufacturer Part Number: TSSIO16E
• Description: Tssio16e Van Peripheral Circuit 16 Inputs-outputs
• Manufacturer: ATMEL Corporation

4.2.2
4.2.3
4421B–ASSP–10/05
Local address 2 and 3
Local address 4 and 5
The writing of port A must be carried out with 1, 2 or 3 data bytes, otherwise the frame will not be
acknowledged and not taken into consideration. If writing uses a single byte, the port will be set
as output and output the DATA_A value. The automobile environment is thus affected by inter-
ference (possibility of deprogramming), it is advisable to write to ports A and B systematically
using 3 bytes.
A read frame RANK16 at local address 3 recovers the data byte present on port A wether the
direction is input or output.
A write frame for port A and B contains 6 bytes. The management of the DATA, DDR and OPT
bytes is the same as in the case of port A alone.
OPT_B register must be forced to 0.
DATA_A :
DDR_A :
OPT_A :
DATA_A
DATA_A
or
DDR_A
Defines, bit by bit, the direction of the I/O pins for port A (0 = input, 1 = output).
DATA_A
Reading of port A and B
Writing of port A and B
Reading of port A
Writing of port A
Unused register, this register must be forced to 0.
OPT_A
DDR_A
Output byte value for port A.
or
DATA_B
DATA_A
DDR_B
DDR_A
TSSIO16E
I3
I3
I3
I3
0
0
1
1
OPT_B
I2
OPT_A
I2
I2
I2
1
1
0
0
I1
I1
I1
I1
0
1
0
1
5