PIC18F2450 MICROCHIP [Microchip Technology], PIC18F2450 Datasheet - Page 124

• Manufacturer Part Number: PIC18F2450
• Description: 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2450/4450
12.2
Timer2 also can generate an optional device interrupt.
The Timer2 output signal (TMR2 to PR2 match)
provides 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>).
FIGURE 12-1:
TABLE 12-1:
DS39760A-page 122
INTCON GIE/GIEH PEIE/GIEL
PIR1
PIE1
IPR1
TMR2
T2CON
PR2
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Timer2 module.
Name
T2OUTPS3:T2OUTPS0
T2CKPS1:T2CKPS0
F
OSC
Timer2 Interrupt
Timer2 Register
Timer2 Period Register
/4
Bit 7
—
—
—
—
REGISTERS ASSOCIATED WITH TIMER2 AS A TIMER/COUNTER
T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0
TIMER2 BLOCK DIAGRAM
ADIE
ADIP
ADIF
Bit 6
Internal Data Bus
1:1, 1:4, 1:16
2
Prescaler
TMR0IE
RCIF
RCIE
RCIP
Bit 5
Advance Information
4
INT0IE
Bit 4
TXIF
TXIE
TXIP
TMR2
Reset
8
RBIE
Bit 3
A range of 16 postscale options (from 1:1 through 1:16
inclusive) can be selected with the postscaler control
bits, T2OUTPS3:T2OUTPS0 (T2CON<6:3>).
12.3
The unscaled output of TMR2 is available primarily to
the CCP module, where it is used as a time base for
operations in PWM mode.
—
—
—
Comparator
1:1 to 1:16
Postscaler
TMR2 Output
TMR0IF
CCP1IE
CCP1IP
CCP1IF
8
TMR2/PR2
Match
Bit 2
TMR2IE
TMR2IP
TMR2IF
INT0IF
Bit 1
© 2006 Microchip Technology Inc.
PR2
8
TMR1IE
TMR1IP
TMR1IF
Set TMR2IF
TMR2 Output
(to PWM)
RBIF
Bit 0
on page
Values
Reset
49
51
51
51
50
50
50