PIC18F6520-I Datasheet, PDF (144/380 Pages) Micrel Semiconductor – 64/80-Pin High-Performance, 256 Kbit to 1 Mbit Enhanced Flash Microcontrollers with A/D

PIC18F6520/8520/6620/8620/6720/8720
13.2 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 13-1:
TIMER2 BLOCK DIAGRAM
13.3 Output of TMR2
The output of TMR2 (before the postscaler) is fed to the
synchronous serial port module, which optionally uses
it to generate the shift clock.
TMR2
Output⁽¹⁾
Sets Flag
bit TMR2IF
FOSC/4
Prescaler
1:1, 1:4, 1:16
2
T2CKPS1:T2CKPS0
TMR2
Reset
Comparator
Postscaler
EQ ^{1:1 to 1:16}
PR2
4
T2OUTPS3:T2OUTPS0
Note 1: TMR2 register output can be software selected by the SSP module as a baud clock.
TABLE 13-1: 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
Value on
POR, BOR
Value on
all other
Resets
INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE
RBIE TMR0IF INT0IF RBIF 0000 0000 0000 0000
PIR1
PSPIF
ADIF
RCIF
TXIF
SSPIF CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000
PIE1
PSPIE
ADIE
RCIE
TXIE
SSPIE CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000
IPR1
PSPIP
ADIP
RCIP
TXIP
SSPIP CCP1IP TMR2IP TMR1IP 0111 1111 0111 1111
TMR2 Timer2 Module Register
0000 0000 0000 0000
T2CON
— T2OUTPS3 T2OUTPS2 T2OUTPS1 T2OUTPS0 TMR2ON T2CKPS1 T2CKPS0 -000 0000 -000 0000
PR2
Timer2 Period Register
1111 1111 1111 1111
Legend: x = unknown, u = unchanged, – = unimplemented, read as ‘0’. Shaded cells are not used by the Timer2 module.
DS39609B-page 142
 2004 Microchip Technology Inc.