TSSIO16E ATMEL Corporation, TSSIO16E Datasheet - Page 4

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

4. Functional Features
4.1
4.2
4.2.1
4
Content of Identifier Field
Addressing of ports A and B and of COMMAND and STATUS registers
TSSIO16E
Local address 0 and 1
The TSSIO16E circuit identifier field is structured as shown below.
The local address consists of bits I1, I2 and I3 of the identifier field for the VAN frame addressing
the circuit, the Bit I1 indicates reading or writing. The table below gives the significance of these
bits.
The specific functions of the circuit are activated by the selection of one or two ports depending
on the local address decoding (see § 4.1) as contained in the identifier field of the VAN frame
received by the circuit and by the content of the data bytes for this frame.
Writing and reading of these registers are described in paragraph 4.4.
The writing of the COMMAND register uses a single data byte. The reading of the STATUS reg-
ister sends a data byte to RANK 16.
I3
0
0
0
0
1
1
1
1
Identifier field
(undecoded)
I2
0
0
1
1
0
0
1
1
I1
0
1
0
1
0
1
0
1
local address
Writing of the COMMAND register
Reading of the STATUS register
External wired address
0
1
2
3
4
5
6
7
reading of VAN STATUS register (RANK 16)
writing of VAN CONTROL register
reading of port AB (RANK 16)
reading of port A (RANK 16)
reading of port B (RANK 16)
Local address
writing of port AB
writing of port A
writing of port B
action
I3
0
0
4421B–ASSP–10/05
I2
0
0
I1
0
1