Microchip Technology MA330020 Data Sheet
2008-2014 Microchip Technology Inc.
DS70000318G-page 183
dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04
11.0
TIMER1
The Timer1 module is a 16-bit timer, which can serve
as a time counter for the Real-Time Clock (RTC), or
operate as a free-running interval timer/counter.
as a time counter for the Real-Time Clock (RTC), or
operate as a free-running interval timer/counter.
The Timer1 module has the following unique features
over other timers:
over other timers:
• Can be operated from the low-power 32 kHz
crystal oscillator available on the device
• Can be operated in Asynchronous Counter mode
from an external clock source
• Optionally, the external clock input (T1CK) can be
synchronized to the internal device clock and the
clock synchronization is performed after the
prescaler
clock synchronization is performed after the
prescaler
The unique features of Timer1 allow it to be used for
Real-Time Clock (RTC) applications. A block diagram
of Timer1 is shown in
Real-Time Clock (RTC) applications. A block diagram
of Timer1 is shown in
The Timer1 module can operate in one of the following
modes:
modes:
• Timer mode
• Gated Timer mode
• Synchronous Counter mode
• Asynchronous Counter mode
• Gated Timer mode
• Synchronous Counter mode
• Asynchronous Counter mode
In Timer and Gated Timer modes, the input clock is
derived from the internal instruction cycle clock (F
derived from the internal instruction cycle clock (F
CY
).
In Synchronous and Asynchronous Counter modes,
the input clock is derived from the external clock input
at the T1CK pin.
the input clock is derived from the external clock input
at the T1CK pin.
The Timer modes are determined by the following bits:
• Timer Clock Source Control bit (TCS): T1CON<1>
• Timer Synchronization Control bit (TSYNC):
T1CON<2>
• Timer Gate Control bit (TGATE): T1CON<6>
The timer control bit settings for different operating
modes are given in the
modes are given in the
TABLE 11-1:
TIMER MODE SETTINGS
FIGURE 11-1:
16-BIT TIMER1 MODULE BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the dsPIC33FJ06GS101/X02 and
dsPIC33FJ16GSX02/X04 families of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to “Timers” (DS70205) in
the “dsPIC33F/PIC24H Family Reference
Manual”, which is available from the
Microchip web site (
dsPIC33FJ16GSX02/X04 families of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to “Timers” (DS70205) in
the “dsPIC33F/PIC24H Family Reference
Manual”, which is available from the
Microchip web site (
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
and bit information.
Mode
TCS
TGATE
TSYNC
Timer
0
0
x
Gated Timer
0
1
x
Synchronous
Counter
Counter
1
x
1
Asynchronous
Counter
Counter
1
x
0
TGATE
TCS
00
10
x1
TMR1
Comparator
PR1
TGATE
Set T1IF Flag
0
1
TSYNC
1
0
Sync
Equal
Reset
T1CK
Prescaler
(/n)
TCKPS<1:0>
Gate
Sync
Sync
F
CY
Falling Edge
Detect
Prescaler
(/n)
TCKPS<1:0>