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dsPIC30F
9.2
General Purpose Timer Modules
Further, the following operational characteristics are
The General Purpose (GP) Timer modules provide the
time base elements for Input Capture and Output
Compare/PWM. They can be configured for real-time
clock operation as well as various timer/counter
modes. The timer modes count pulses of the internal
time base, whereas counter modes count external
pulses that appear on the Timer Clock pin.
The dsPIC30F device supports up to five 16-bit timers
(Timer1 through Timer5). Four of the 16-bit timers can
be configured as two 32-bit timers (Timer2/3 and 4/5).
supported:
? Timer gated by external pulse
? Selectable prescaler settings
? Timer operation during CPU Idle and Sleep
modes
? Interrupt on 16-bit Period register match or falling
edge of external gate signal
Timer1, when operating in Real-Time Clock (RTC)
mode, provides time of day and event time-stamping
capabilities. Key operational features of the RTC are:
Each timer has several selectable operating modes.
?
Operation from 32 kHz LP oscillator
9.2.1
TIMER1
?
8-bit prescaler
The Timer1 module (Figure 9-1) is a 16-bit timer that
can serve as the time counter for an asynchronous
real-time clock, or operate as a free-running interval
timer/counter. The 16-bit timer has the following
modes:
? 16-bit Timer
? 16-bit Synchronous Counter
? 16-bit Asynchronous Counter
?
?
Low power
Real-Time Clock interrupts
FIGURE 9-1:
16-BIT TIMER1 MODULE BLOCK DIAGRAM
PR1
T1IF
0
Equal
Reset
Comparator x 16
TMR1
TSYNC
1
0
Sync
Event Flag
1
Q
D
TGATE
Q
CK
TGATE
TCKPS<1:0>
SOSCO/
T1CK
1x
TON
2
SOSCI
? 2005 Microchip Technology Inc.
LPOSCEN
Gate
Sync
T CY
01
00
Prescaler
1, 8, 64, 256
DS70043F-page 25
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