Microchip Technology dsPIC30F6010, Datasheet

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 2004 Microchip Technology Inc.
Advance Information
DS70119B-page 57
dsPIC30F6010
9.0 TIMER1 MODULE
This section describes the 16-bit General Purpose
(GP) Timer1 module and associated operational
modes. Figure 9-1 depicts the simplified block diagram
of the 16-bit Timer1 Module.
The following sections provide a detailed description,
including setup and control registers along with associ-
ated block diagrams for the operational modes of the
timers.
The Timer1 module is a 16-bit timer which can serve as
the time counter for the 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
Further, the following operational characteristics are
supported:
• Timer gate operation
• 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
These operating modes are determined by setting the
appropriate bit(s) in the 16-bit SFR, T1CON. Figure 9-1
presents a block diagram of the 16-bit timer module.
16-bit Timer Mode: In the 16-bit Timer mode, the timer
increments on every instruction cycle up to a match
value, preloaded into the period register PR1, then
resets to 0 and continues to count.
When the CPU goes into the Idle mode, the timer will
stop incrementing, unless the TSIDL (T1CON<13>)
bit =
0
. If TSIDL =
1
, the timer module logic will resume
the incrementing sequence upon termination of the
CPU Idle mode.
16-bit Synchronous Counter Mode: In the 16-bit
Synchronous Counter mode, the timer increments on
the rising edge of the applied external clock signal,
which is synchronized with the internal phase clocks.
The timer counts up to a match value preloaded in PR1,
then resets to 0 and continues.
When the CPU goes into the Idle mode, the timer will
stop incrementing, unless the respective TSIDL bit =
0
.
If TSIDL =
1
, the timer module logic will resume the
incrementing sequence upon termination of the CPU
Idle mode.
16-bit Asynchronous Counter Mode: In the 16-bit
Asynchronous Counter mode, the timer increments on
every rising edge of the applied external clock signal.
The timer counts up to a match value preloaded in PR1,
then resets to
0
and continues.
When the timer is configured for the Asynchronous mode
of operation and the CPU goes into the Idle mode, the
timer will stop incrementing if TSIDL =
1
.
FIGURE 9-1: 16-BIT TIMER1 MODULE BLOCK DIAGRAM (TYPE A TIMER)
Note: Timer1 is a ‘Type A’ timer. Please refer to
the specifications for a Type A timer in
Section 24.0 Electrical Characteristics of
this document.
TON
Sync
SOSCI
SOSCO/
PR1
T1IF
Equal
Comparator x 16
TMR1
Reset
LPOSCEN
Event Flag
1
0
TSYNC
Q
Q D
CK
TGATE
TCKPS<1:0>
Prescaler
1, 8, 64, 256
2
TGATE
T
CY
1
0
T1CK
TCS
1 X
0 1
TGA
TE
0 0
(3)
Gate
Sync