Microchip Technology IC MCU 8BIT PIC18F65K22-I/PT TQFP-64 MCP PIC18F65K22-I/PT Data Sheet
Product codes
PIC18F65K22-I/PT
2009-2011 Microchip Technology Inc.
DS39960D-page 203
PIC18F87K22 FAMILY
14.7
Resetting Timer1 Using the ECCP
Special Event Trigger
Special Event Trigger
If ECCP modules are configured to use Timer1 and to
generate a Special Event Trigger in Compare mode
(CCPxM<3:0> = 1011), this signal will reset Timer1. The
trigger from ECCP2 will also start an A/D conversion, if
the A/D module is enabled. (For more information, see
generate a Special Event Trigger in Compare mode
(CCPxM<3:0> = 1011), this signal will reset Timer1. The
trigger from ECCP2 will also start an A/D conversion, if
the A/D module is enabled. (For more information, see
To take advantage of this feature, the module must be
configured as either a timer or a synchronous counter.
When used this way, the CCPRxH:CCPRxL register
pair effectively becomes a period register for Timer1.
If Timer1 is running in Asynchronous Counter mode,
this Reset operation may not work.
In the event that a write to Timer1 coincides with a
Special Event Trigger, the write operation will take
precedence.
configured as either a timer or a synchronous counter.
When used this way, the CCPRxH:CCPRxL register
pair effectively becomes a period register for Timer1.
If Timer1 is running in Asynchronous Counter mode,
this Reset operation may not work.
In the event that a write to Timer1 coincides with a
Special Event Trigger, the write operation will take
precedence.
14.8
Timer1 Gate
Timer1 can be configured to count freely or the count can
be enabled and disabled using the Timer1 gate circuitry.
This is also referred to as Timer1 gate count enable.
Timer1 gate can also be driven by multiple selectable
sources.
be enabled and disabled using the Timer1 gate circuitry.
This is also referred to as Timer1 gate count enable.
Timer1 gate can also be driven by multiple selectable
sources.
14.8.1
TIMER1 GATE COUNT ENABLE
The Timer1 Gate Enable mode is enabled by setting
the TMR1GE bit of the T1GCON register. The polarity
of the Timer1 Gate Enable mode is configured using
the T1GPOL bit (T1GCON<6>).
When Timer1 Gate Enable mode is enabled, Timer1
will increment on the rising edge of the Timer1 clock
source. When Timer1 Gate Enable mode is disabled,
no incrementing will occur and Timer1 will hold the
current count. See
the TMR1GE bit of the T1GCON register. The polarity
of the Timer1 Gate Enable mode is configured using
the T1GPOL bit (T1GCON<6>).
When Timer1 Gate Enable mode is enabled, Timer1
will increment on the rising edge of the Timer1 clock
source. When Timer1 Gate Enable mode is disabled,
no incrementing will occur and Timer1 will hold the
current count. See
for timing details.
TABLE 14-3:
TIMER1 GATE ENABLE
SELECTIONS
SELECTIONS
Note:
The Special Event Trigger from the
ECCPx module will only clear the TMR1
register’s content, but not set the TMR1IF
interrupt flag bit (PIR1<0>).
ECCPx module will only clear the TMR1
register’s content, but not set the TMR1IF
interrupt flag bit (PIR1<0>).
T1CLK
T1GPOL
(T1GCON<6>)
T1G Pin
Timer1
Operation
0
0
Counts
0
1
Holds Count
1
0
Holds Count
1
1
Counts
† The clock on which TMR1 is running. For more
information, see
.
Note:
The CCP and ECCP modules use Timers,
1 through 8, for some modes. The assign-
ment of a particular timer to a CCP/ECCP
module is determined by the Timer to CCP
enable bits in the CCPTMRSx registers.
For more details, see
1 through 8, for some modes. The assign-
ment of a particular timer to a CCP/ECCP
module is determined by the Timer to CCP
enable bits in the CCPTMRSx registers.
For more details, see
,
.