PIC16F1507-ESLASHSS. datasheet(181/278 Pages) MICROCHIP

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DS40001586D-page 181

PIC16(L)F1507

22.8

Dead-Band Uncertainty

When the rising and falling edges of the input source

triggers the dead-band counters, the input may be asyn-

chronous. This will create some uncertainty in the dead-

band time delay. The maximum uncertainty is equal to

one CWG clock period. Refer to Equation 22-1 for more

detail.

EQUATION 22-1:

DEAD-BAND

UNCERTAINTY

22.9

Auto-Shutdown Control

Auto-shutdown is a method to immediately override the

CWG output levels with specific overrides that allow for

safe shutdown of the circuit. The shutdown state can be

either cleared automatically or held until cleared by

software.

22.9.1

SHUTDOWN

The shutdown state can be entered by either of the

following two methods:

• Software generated

• External Input

22.9.1.1

Software Generated Shutdown

Setting the GxASE bit of the CWGxCON2 register will

force the CWG into the shutdown state.

When auto-restart is disabled, the shutdown state will

persist as long as the GxASE bit is set.

When auto-restart is enabled, the GxASE bit will clear

automatically and resume operation on the next rising

edge event. See Figure 22-6.

22.9.1.2

External Input Source

External shutdown inputs provide the fastest way to

safely suspend CWG operation in the event of a Fault

condition. When any of the selected shutdown inputs

goes active, the CWG outputs will immediately go to

the selected override levels without software delay. Any

combination of two input sources can be selected to

cause a shutdown condition. The sources are:

• CLC2 – LC2_out

•CWG1FLT

Shutdown inputs are selected in the CWGxCON2

TDEADBAND_UNCERTAINTY

Fcwg_clock

-----------------------------

Therefore:

Fcwg_clock

16 MHz

-------------------

62.5ns

TDEADBAND_UNCERTAINTY

Fcwg_clock

-----------------------------

Example:

Note:

Shutdown inputs are level sensitive, not

edge sensitive. The shutdown state can-

not be cleared, except by disabling auto-

shutdown, as long as the shutdown input

level persists.

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