Microchip Technology MCU PIC PIC18F87K22-I/PTRSL TQFP-80 MCP PIC18F87K22-I/PTRSL Data Sheet

DS39960D-page 198

 2009-2011 Microchip Technology Inc.

The Timer1 Gate Control register (T1GCON),
displayed in 

, is used to control the

Timer1 gate.

R/W-0

R/W-0

R/W-0

R/W-0

R/W-0

R-x

R/W-0

R/W-0

TMR1GE

T1GPOL

T1GTM

T1GSPM

T1GGO/T1DONE

T1GVAL

T1GSS1

T1GSS0

bit 7

bit 0

Legend:
R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

 Timer1 Gate Enable bit

If TMR1ON = 0:
This bit is ignored.
If TMR1ON = 1:
1

 = Timer1 counting is controlled by the Timer1 gate function

0

 = Timer1 counts regardless of Timer1 gate function

bit 6

Timer1 Gate Polarity bit

1

 = Timer1 gate is active-high (Timer1 counts when gate is high)

0

 = Timer1 gate is active-low (Timer1 counts when gate is low)

bit 5

Timer1 Gate Toggle Mode bit

1

 = Timer1 Gate Toggle mode is enabled

0

 = Timer1 Gate Toggle mode is disabled and toggle flip-flop is cleared

Timer1 gate flip-flop toggles on every rising edge.

bit 4

Timer1 Gate Single Pulse Mode bit

1

 = Timer1 Gate Single Pulse mode is enabled and is controlling Timer1 gate

0

 = Timer1 Gate Single Pulse mode is disabled

bit 3

Timer1 Gate Single Pulse Acquisition Status bit

1

 = Timer1 gate single pulse acquisition is ready, waiting for an edge

0

 = Timer1 gate single pulse acquisition has completed or has not been started

This bit is automatically cleared when T1GSPM is cleared.

bit 2

Timer1 Gate Current State bit

Indicates the current state of the Timer1 gate that could be provided to TMR1H:TMR1L; unaffected by
Timer1 Gate Enable (TMR1GE) bit.

bit 1-0

Timer1 Gate Source Select bits

11

 = Comparator 2 output

10

 = Comparator 1 output

01

 = TMR2 to match PR2 output

00

 = Timer1 gate pin

Programming the T1GCON prior to T1CON is recommended.