Echelon I/O Model Reference for Smart Transceivers and Neuron Chips - Manual (Page 195)

I/O Model Reference 185
Table 65. Triggered Count Output Latency Values for Series 3100 Devices
Symbol Description Typical at 10 MHz
t
fout
Function call to output update 109 μs
t
cod
Last negative sync
Clock edge to output inactive min 550 ns
max 750 ns
t
ret
Return from function 7 μs
Programming Considerations
The triggeredcount I/O model is used to control an output pin to the active state
and keep it active until output-value negative edges are counted at the input sync
pin. After output-value edges have counted off, the output pin returns to the low
state.
For triggeredcount output, the data type of
output-value for the io_out( ) function
is an unsigned long. An output-value of 0 forces the output signal to an inactive
state.
Syntax
pin [output] triggeredcount sync ( pin-nbr ) [invert] io-object-name
[= initial-output-level ] ;
pin
An I/O pin. Triggeredcount output can specify pins IO_0 or IO_1. If IO_0 is
specified, the multiplexed timer/counter is used and the sync pin can be IO_4
through IO_7. If IO_1 is specified, the dedicated timer/counter is used and
the sync pin must be IO_4.
sync ( pin-nbr )
Specifies the sync pin, which is the counting input signal with low pulses.
invert
Causes the output signal to be inverted, normally high. By default, the
output signal is normally low with high pulses.
io-object-name
A user-specified name for the I/O object, in the ANSI C format for variable
identifiers.
initial-output-level
A constant expression, in ANSI C format for initializers, used to set the state
of the output pin of the I/O object at initialization. The initial state can be 0
or 1. The default initial state is 0.