PIC16F716
DS41206A-page 32
Preliminary
2003 Microchip Technology Inc.
6.1
Timer2 Operation
Timer2 can be used as the PWM time base for PWM
mode of the ECCP module.
The TMR2 register is readable and writable, and is
cleared on any device Reset
The input clock (F
OSC
/4) has a prescale option of 1:1,
1:4 or 1:16, selected by control bits
T2CKPS1:T2CKPS0 (T2CON<1:0>).
The match output of TMR2 goes through a 4-bit
postscaler (which gives a 1:1 to 1:16 scaling inclusive)
to generate a TMR2 interrupt (latched in flag bit
TMR2IF, (PIR1<1>).
The prescaler and postscaler counters are cleared
when any of the following occurs:
• A write to the TMR2 register
• A write to the T2CON register
• Any device Reset (Power-on Reset, MCLR Reset,
Watchdog Timer Reset, or Brown-out Reset)
TMR2 is not cleared when T2CON is written.
6.2
Timer2 Interrupt
The Timer2 module has an 8-bit Period register (PR2).
Timer2 increments from 00h until it matches PR2 and
then resets to 00h on the next increment cycle. PR2 is
a readable and writable register. The PR2 register is
initialized to FFh upon Reset.
FIGURE 6-1:
TIMER2 BLOCK DIAGRAM
TABLE 6-1:
REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER
Comparator
TMR2
Sets flag
TMR2 reg
output
Reset
Postscaler
Prescaler
PR2 reg
2
F
OSC
/4
1:1
1:16
1:1, 1:4, 1:16
EQ
4
bit TMR2IF
to
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR,
BOR
Value on
all other
Resets
0Bh, 8Bh
INTCON
GIE
PEIE
T0IE
INTE
RBIE
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