Application Note
9
2015-02-11
Revision 1.0
ISO2H823V2.5 Evaluation Board
Board Manual
Functional Description
2.2.1.1
Parallel Direct Mode
The parallel interface can be also used in a direct mode that allows direct changes of the output OUT0...OUT7 by
means of the corresponding inputs AD0-AD7 without additional logic signals. To activate the parallel direct mode
CS, WR and ALE pins have to be wired to ground and RD has to be wired to
V
CC
as shown in the
. The
asynchronous output disable
ODIS
has to be tied high, because this safety function will otherwise override the
drive information. Although the diagnostics cannot be read in this operation mode, W4P (Wait for power) and OTC
over temperature faults are reported at the ERR pin (volatile).
Figure 6
Parallel Direct Mode
The direct mode is intended to be an additional parallel mode which is invoked directly after reset. In this case
internal settings have already been realized (f.e. MSB of the address register is set to “1” ).
V
CC
CS
WR
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
Hos
t
IS
O2
H
82
3
V
2
parallel _interface_direct_iso2h823.vsd
V
CC
ALE
SEL
RD
