Echelon I/O Model Reference for Smart Transceivers and Neu Manuale Utente Scaricare il pdf (Pagina 162)

152 Timer/Counter Input Models

read input_value = 4, resetread, reset

ret

fin

READ

TIMER/

COUNTER

FLAG AND

EVENT

CLEAR FLAG

END OF

io_in()

START OF

io_in()

mux

Event Register

IO10

IO9

IO8

IO0

IO1

IO2

IO3

IO4

IO5

IO6

IO7

Optional Pull-Up Resistors for 3100 Family Devices

Event Register

Timer/Counter 2

Timer/Counter 1

IO11

Figure 57. Totalcount Input and Timing

Table 57. Totalcount Input Latency Values for Series 3100 Devices

Symbol Description Typical at 10 MHz

fin

Function call to input sample 92 μs

ret

Return from function 61 μs

Programming Considerations

For totalcount input, the data type of return_value for the io_in( ) function is an

unsigned long.

The minimum duration for a high or low input signal for this I/O object is 50 ns

for a Series 3100 device with a 40 MHz input clock, or 12.5 ns for a Series 5000

device with an 80 MHz system clock. This value scales inversely with the input

clock speed.

1 2 ... 157 158 159 160 161 162 163 164 165 166 167 ... 208 209

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Echelon I/O Model Reference for Smart Transceivers and Neu Manuale Utente Pagina 162

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