Echelon I/O Model Reference for Smart Transceivers and Neu Instrukcja Użytkownika Pobierz pdf (Strona 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()

ret

NEW OUTPUT

APPEARS ON PIN

HARDWARE

UPDATED

INTERNALLY

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

fout

Function call to output update 96 μs

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).

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