Microchip Technology MCU PIC PIC18F87K22-I/PTRSL TQFP-80 MCP PIC18F87K22-I/PTRSL Data Sheet
Product codes
PIC18F87K22-I/PTRSL
2009-2011 Microchip Technology Inc.
DS39960D-page 213
PIC18F87K22 FAMILY
16.1
Timer3/5/7 Gate Control Register
The Timer3/5/7 Gate Control register (TxGCON),
provided in Register 14-2, is used to control the Timerx
gate.
provided in Register 14-2, is used to control the Timerx
gate.
REGISTER 16-2:
TxGCON: TIMERx GATE CONTROL REGISTER
(
)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R-x
R/W-0
R/W-0
TMRxGE
TxGPOL
TxGTM
TxGSPM
TxGGO/TxDONE
TxGVAL
TxGSS1
TxGSS0
bit 7
bit 0
Legend:
R = Readable bit
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
TMRxGE:
Timerx Gate Enable bit
If TMRxON = 0:
This bit is ignored.
If TMRxON = 1:
1
This bit is ignored.
If TMRxON = 1:
1
= Timerx counting is controlled by the Timerx gate function
0
= Timerx counts regardless of Timerx gate function
bit 6
TxGPOL:
Timerx Gate Polarity bit
1
= Timerx gate is active-high (Timerx counts when gate is high)
0
= Timerx gate is active-low (Timerx counts when gate is low)
bit 5
TxGTM:
Timerx Gate Toggle Mode bit
1
= Timerx Gate Toggle mode is enabled.
0
= Timerx Gate Toggle mode is disabled and toggle flip-flop is cleared
Timerx gate flip-flop toggles on every rising edge.
bit 4
TxGSPM:
Timerx Gate Single Pulse Mode bit
1
= Timerx Gate Single Pulse mode is enabled and is controlling Timerx gate
0
= Timerx Gate Single Pulse mode is disabled
bit 3
TxGGO/TxDONE:
Timerx Gate Single Pulse Acquisition Status bit
1
= Timerx gate single pulse acquisition is ready, waiting for an edge
0
= Timerx gate single pulse acquisition has completed or has not been started
This bit is automatically cleared when TxGSPM is cleared.
bit 2
TxGVAL:
Timerx Gate Current State bit
Indicates the current state of the Timerx gate that could be provided to TMRxH:TMRxL. Unaffected by the
Timerx Gate Enable (TMRxGE) bit.
Timerx Gate Enable (TMRxGE) bit.
bit 1-0
TxGSS<1:0>:
Timerx Gate Source Select bits
11
= Comparator 2 output
10
= Comparator 1 output
01
= TMR(x+1) to match PR(x+1) output
00
= Timer1 gate pin
The Watchdog Timer oscillator is turned on if TMRxGE = 1, regardless of the state of TMRxON.
Note 1:
Programming the TxGCON prior to TxCON is recommended.
2:
Timer(x+1) will be Timer4/6/8 for Timerx (Timer3/5/7), respectively.