TSSIO16E ATMEL Corporation, TSSIO16E Datasheet - Page 7

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

4.4
4.4.1
4421B–ASSP–10/05
COMMAND and STATUS registers
Management of RXD0, RXD1, RXD2 lines and common access to peripherals
These two specialized registers ensure command and monitoring functions as follows:
These registers have the following structure:
The purpose of line diagnosis is to find a line that operates before exiting from NORMAL mode
to enter SAFETY mode. This diagnosis is covered by events or TIME-OUT’s with which the
time-out’s are associated.
The duration of the time-out depends from the internal oscillator which varies in a ratio of 1 to 5.
The implementing of the 500kHz external RC oscillator dedicated to the safety mode permits
more accurate time delays, for example: Rext = 8.66k
ances on R and C include all drifts (temperature, ageing...).
• Lines management according to a line diagnosis carried out constantly. This line diagnosis
• Accesses management to common peripherals shared by several circuits.
SLTO
SLTO (ms)
MTO
MTO (ms)
STO
LTO
STO (ms)
analyzes the transmission state and allows a choice of the RXD0, RXD1, RXD2 inputs
depending on some of the TIME-OUT’s (STO, MTO, LTO and SLTO);
LTO (ms)
Short time-out: the bus remains in a dominant state for a period of time incompatible with the definition of
duration
relative
T/16
4 T
T/4
T
Medium time-out: absence of coherent frame on VAN bus
Long time-out: no coherent frame addressing the circuit
2700
min
200
900
30
User module number
500 kHz external oscillator
Protection bit or occupation flag
Super long time-out: 4 TOL
1000
4000
62.5
250
typ
the frames.
Selection/status input lines
Surveillance or mode bit
1150
4650
max
300
75
5% and Cext = 1nF 5%. The toler-
1200
min
400
13
90
1000
4000
TSSIO16E
62.5
250
typ
2100
8400
max
132
525
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