PIC18F67J11T-I Datasheet, PDF (204/466 Pages) Microchip Technology – 64/80-Pin, High-Performance, 1-Mbit Flash Microcontrollers

PIC18F87J11 FAMILY
15.2 Timer2 Interrupt
Timer2 can also generate an optional device interrupt.
The Timer2 output signal (TMR2 to PR2 match) pro-
vides the input for the 4-bit output counter/postscaler.
This counter generates the TMR2 match interrupt flag
which is latched in TMR2IF (PIR1<1>). The interrupt is
enabled by setting the TMR2 Match Interrupt Enable
bit, TMR2IE (PIE1<1>).
A range of 16 postscale options (from 1:1 through 1:16
inclusive) can be selected with the postscaler control
bits, T2OUTPS<3:0> (T2CON<6:3>).
FIGURE 15-1:
TIMER2 BLOCK DIAGRAM
T2OUTPS<3:0>
T2CKPS<1:0>
FOSC/4
4
2
1:1, 1:4, 1:16
Prescaler
Internal Data Bus
Reset
TMR2
8
15.3 Timer2 Output
The unscaled output of TMR2 is available primarily to
the ECCPx/CCPx modules, where it is used as a time
base for operations in PWM mode.
Timer2 can be optionally used as the shift clock source
for the MSSP modules operating in SPI mode.
Additional information is provided in Section 20.0
“Master Synchronous Serial Port (MSSP) Module”.
1:1 to 1:16
Postscaler
TMR2/PR2
Match
Comparator
8
Set TMR2IF
TMR2 Output
(to PWM or MSSPx)
PR2
8
TABLE 15-1: REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER
Name Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on Page:
INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE
RBIE
TMR0IF INT0IF
RBIF
61
PIR1
PMPIF
ADIF
RC1IF
TX1IF
SSP1IF CCP1IF TMR2IF TMR1IF
64
PIE1
PMPIE
ADIE
RC1IE
TX1IE
SSP1IE CCP1IE TMR2IE TMR1IE
64
IPR1
PMPIP
ADIP
RC1IP
TX1IP
SSP1IP CCP1IP TMR2IP TMR1IP
64
TMR2⁽¹⁾ Timer2 Register
62
T2CON
— T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0 62
PR2⁽¹⁾ Timer2 Period Register
62
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Timer2 module.
Note 1: Default (legacy) SFR at this address, available when WDTCON<4> = 0.
DS39778E-page 204
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