Echelon I/O Model Reference for Smart Transceivers and Neuron Chips - Manual (Page 170)

160 Timer/Counter Output Models
System Clock
Divide Chain
Timer/Counter 1
Timer/Counter 2
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
High Current Sink Drivers
IO11
Figure 59. Frequency Output
END
OF io_out()
t
ret
NEW OUTPUT
APPEARS ON PIN
HARDWARE
UPDATED
INTERNALLY
t
fout
START
OF io_out()
TIME
FREQUENCY
OUTPUT
ONE CYCLE
Figure 60. Frequency Output Timing
Table 59. Frequency Output Latency Values for Series 3100 Devices
Symbol Description Typical at 10 MHz
t
fout
Function call to output update 96 μs
t
ret
Return from function 13 μs
Programming Considerations
For frequency output, the data type of output_value for io_out( ) is an unsigned
long. An output_value of 0 forces the output signal to a low state (unless the
invert keyword is used in the declaration).