Echelon I/O Model Reference for Smart Transceivers and Neuron Chips - Manual (Page 137)

I/O Model Reference 127
Timer/Counter 1
Timer/Counter 2
IO10
IO9
IO8
IO0
IO1
IO2
IO3
IO4
IO5
IO6
IO7
mux
Control Output
From
Comparator
IO11
OUTPUT
(IO0 OR IO1)
START OF
io_in_request()
END OF
io_in()
LATCHED COUNT
AVAILABLE TO
APPLICATION
START
OF io_in()
TIME
INPUT
(IO4 TO IO7)
ANALOG SWITCH
CONTROL
COMPARATOR
OUTPUT
INTEGRATOR
OUTPUT
V
thresh
t
reqo
t
fin
Figure 48. Dualslope Input and Timing
Table 49. Dualslope Input Latency Values for Series 3100 Devices
Symbol Description Minimum Typical Maximum
t
reqo
io_in_request() to output toggle — 75.6 μs —
t
fin
Input function call and return — 82.8 μs —
Programming Considerations
For dualslope input, the data type of the control_value for the io_in_request( )
function is an unsigned long. The return value of the io_in( ) function is an
unsigned long. Both the return value for io_in( ) and the value stored at
input_value is a number biased negatively by the control_value used for the
io_in_request( ) function, and can be corrected by adding the control_value value
into it.