Microchip Technology ARD00385 Data Sheet
2009-2011 Microchip Technology Inc.
DS39957D-page 215
PIC18F87K90 FAMILY
16.2
Timer4/6/8/10/12 Interrupt
The Timer4/6/8/10/12 modules have 8-bit Period
registers, PRx, that are both readable and writable.
Timer4/6/8/10/12 increment from 00h until they match
PR4/6/8/10/12 and then reset to 00h on the next
increment cycle. The PRx registers are initialized to
FFh upon Reset.
registers, PRx, that are both readable and writable.
Timer4/6/8/10/12 increment from 00h until they match
PR4/6/8/10/12 and then reset to 00h on the next
increment cycle. The PRx registers are initialized to
FFh upon Reset.
16.3
Output of TMRx
The outputs of TMRx (before the postscaler) are used
only as a PWM time base for the ECCP modules. They
are not used as baud rate clocks for the MSSP
modules as is the Timer2 output.
only as a PWM time base for the ECCP modules. They
are not used as baud rate clocks for the MSSP
modules as is the Timer2 output.
FIGURE 16-1:
TIMER4/6/8/10/12 BLOCK DIAGRAM
TABLE 16-3:
REGISTERS ASSOCIATED WITH TIMER4/6/8/10/12 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
IPR5
TMR7GIP
TMR12IP
(
)
TMR10IP
TMR8IP
TMR7IP
TMR6IP
TMR5IP
TMR4IP
PIR5
TMR7GIF
(
TMR12IF
TMR10IF
(
)
TMR8IF
TMR7IF
TMR6IF
TMR5IF
TMR4IF
PIE5
TMR7GIE
TMR12IE
(
)
TMR10IE
TMR8IE
TMR7IE
TMR6IE
TMR5IE
TMR4IE
TMR4
Timer4 Register
T4CON
—
T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0
TMR4ON
T4CKPS1 T4CKPS0
PR4
Timer4 Period Register
TMR6
Timer6 Register
T6CON
—
T6OUTPS3 T6OUTPS2 T6OUTPS1 T6OUTPS0
TMR6ON
T6CKPS1 T6CKPS0
PR6
Timer6 Period Register
TMR8
Timer8 Register
T8CON
—
T8OUTPS3 T8OUTPS2 T8OUTPS1 T8OUTPS0
TMR8ON
T8CKPS1 T8CKPS0
PR8
Timer8 Period Register
TMR10
Timer10 Register
T10CON
—
T10OUTPS3 T10OUTPS2 T10OUTPS1 T10OUTPS0 TMR10ON T10CKPS1 T10CKPS0
PR10
Timer10 Period Register
TMR12
Timer12 Register
T12CON
—
T12OUTPS3 T12OUTPS2 T12OUTPS1 T12OUTPS0 TMR12ON T12CKPS1 T12CKPS0
PR12
Timer12 Period Register
CCPTMRS0 C3TSEL1
C3TSEL0
C2TSEL2
C2TSEL1
C2TSEL0
C1TSEL2
C1TSEL1 C1TSEL0
CCPTMRS1 C7TSEL1
C7TSEL0
—
C6TSEL0
—
C5TSEL0
C4TSEL1 C4TSEL0
CCPTMRS2
—
—
—
C10TSEL0
—
C9TSEL0
(
)
C8TSEL1 C8TSEL0
Legend:
— = unimplemented, read as ‘0’. Shaded cells are not used by the Timer4/6/8/10/12 module.
Note 1:
Unimplemented in devices with a program memory of 32 Kbytes (PIC18FX5K22).
Comparator
TMRx Output
TMRx
Postscaler
Prescaler
PRx
2
F
OSC
/4
1:1 to 1:16
1:1, 1:4, 1:16
4
TxOUTPS<3:0>
TxCKPS<1:0>
Set TMRxIF
Internal Data Bus
8
Reset
TMRx/PRx
8
8
(to PWM)
Match