PIC18F1220_07 Datasheet, PDF (112/308 Pages) Microchip Technology – 18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-bit A/D and nanoWatt Technology

PIC18F1220/1320
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
TOUTPS3:TOUTPS0
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 000x 0000 000u
PIR1
—
ADIF
RCIF
TXIF
—
CCP1IF TMR2IF TMR1IF -000 -000 -000 -000
PIE1
—
ADIE
RCIE
TXIE
—
CCP1IE TMR2IE TMR1IE -000 -000 -000 -000
IPR1
—
ADIP
RCIP
TXIP
—
CCP1IP TMR2IP TMR1IP -111 -111 -111 -111
TMR2 Timer2 Module Register
0000 0000 0000 0000
T2CON
—
TOUTPS3 TOUTPS2 TOUTPS1 TOUTPS0 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.
DS39605F-page 110
© 2007 Microchip Technology Inc.