PIC16F722-ESLASHML datasheet(119/302 Pages) MICROCHIP

119 / 302 page

DS41341E-page 119

PIC16F72X/PIC16LF72X

TABLE 12-5:

WDT/TIMER1 GATE INTERACTION

12.6.3

TIMER1 GATE TOGGLE MODE

When Timer1 Gate Toggle mode is enabled, it is pos-

sible to measure the full-cycle length of a Timer1 gate

signal, as opposed to the duration of a single level

pulse.

The Timer1 Gate source is routed through a flip-flop

that changes state on every incrementing edge of the

signal. See Figure 12-4 for timing details.

Timer1 Gate Toggle mode is enabled by setting the

T1GTM bit of the T1GCON register. When the T1GTM

bit is cleared, the flip-flop is cleared and held clear. This

is necessary in order to control which edge is

measured.

12.6.4

TIMER1 GATE SINGLE-PULSE

MODE

When Timer1 Gate Single-Pulse mode is enabled, it is

possible to capture a single pulse gate event. Timer1

Gate Single-Pulse mode is first enabled by setting the

T1GSPM bit in the T1GCON register. Next, the

T1GGO/DONE bit in the T1GCON register must be set.

The Timer1 will be fully enabled on the next

incrementing edge. On the next trailing edge of the

pulse, the T1GGO/DONE bit will automatically be

cleared. No other gate events will be allowed to

increment Timer1 until the T1GGO/DONE bit is once

again set in software.

Clearing the T1GSPM bit of the T1GCON register will

also clear the T1GGO/DONE bit. See Figure 12-5 for

timing details.

Enabling the Toggle mode and the Single-Pulse mode

simultaneously will permit both sections to work

together. This allows the cycle times on the Timer1

Gate source to be measured. See Figure 12-6 for

timing details.

12.6.5

TIMER1 GATE VALUE STATUS

When Timer1 Gate Value Status is utilized, it is possi-

ble to read the most current level of the gate control

value. The value is stored in the T1GVAL bit in the

T1GCON register. The T1GVAL bit is valid even when

the Timer1 Gate is not enabled (TMR1GE bit is

cleared).

12.6.6

TIMER1 GATE EVENT INTERRUPT

When Timer1 Gate Event Interrupt is enabled, it is pos-

sible to generate an interrupt upon the completion of a

gate event. When the falling edge of T1GVAL occurs,

the TMR1GIF flag bit in the PIR1 register will be set. If

the TMR1GIE bit in the PIE1 register is set, then an

interrupt will be recognized.

The TMR1GIF flag bit operates even when the Timer1

Gate is not enabled (TMR1GE bit is cleared).

WDTE

TMR1GE = 1

and

T1GSS = 11

WDT Oscillator

Enable

WDT Reset

Wake-up

WDT Available for

T1G Source

Note:

Enabling Toggle mode at the same time as

changing the gate polarity may result in

indeterminate operation.

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