PIC16F1459-ESSQTP datasheet(300/418 Pages) MICROCHIP

300 / 418 page

PIC16(L)F1454/5/9

DS41639A-page 300

Preliminary

 2012 Microchip Technology Inc.

25.9

Auto-Shutdown Control

Auto-shutdown is a method to immediately override the

CWG output levels with specific overrides that allow for

the safe shutdown of the circuit. The shutdown state

can be either cleared automatically or held until cleared

by software.

25.9.1

SHUTDOWN

The shutdown state can be entered by either of the

following two methods:

• Software generated

• External Input

25.9.1.1

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 25-6.

25.9.1.2

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

go active, the CWG outputs will immediately go to the

selected override levels without a software delay. Any

combination of two input sources can be selected to

cause a shutdown condition. The sources are:

• async_C1OUT

• async_C2OUT

•CWG1FLT

Shutdown inputs are selected using the GxASDS0 and

GxASDS1

bits

the

CWGxCON2

(Register 25-3).

25.10 Operation During Sleep

The CWG module operates independently from the

system clock and will continue to run during Sleep,

provided that the clock and input sources selected

remain active.

The HFINTOSC remains active during Sleep, provided

that the CWG module is enabled, the input source is

active, and the HFINTOSC is selected as the clock

source, regardless of the system clock source selected.

In other words, if the HFINTOSC is simultaneously

selected as the system clock and the CWG clock

source, when the CWG is enabled and the input source

is active, the CPU will go idle during Sleep, but the CWG

will continue to operate and the HFINTOSC will remain

active. This will have a direct effect on the Sleep mode

current.

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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