Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario descargar pdf (Pagina 176)

166 Timer/Counter Output Models

the oneshot before the end of the pulse causes it to continue for the new duration.

The resolution and range of the timer/counter period options is described in

Timer/Counter Resolution and Maximum Range

on page 188. This object is

useful for generating a time delay without intervention of the application

processor (see

Figure 62).

While the output is still active, a subsequent call to this function cause the

update to take effect immediately, extending the current cycle. This is, therefore,

a retriggerable oneshot function.

END

io_out()

START

OF 2ND

io_out()

T = User-defined oneshot output period

ONESHOT

OUTPUT

TIME

HARDWARE

UPDATE/

RETRIGGER

HARDWARE

UPDATE

START

OF 1ST

io_out()

fout

Timer/Counter 1

Timer/Counter 2

IO10

IO9

IO8

IO0

IO1

IO2

IO3

IO4

IO5

IO6

IO7

High Current Sink Drivers for 3100 Family Devices

IO11

jit

ret

System Clock

Divide Chain

Figure 62. Oneshot Output and Timing

Table 62. Oneshot 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

jit

Output duration jitter —

1 2 ... 171 172 173 174 175 176 177 178 179 180 181 ... 208 209

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Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario Pagina 176

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