PIC18F87J10 Datasheet, PDF (160/394 Pages) Microchip Technology – 64/80-Pin High-Performance, 1-Mbit Flash Microcontrollers with nanoWatt Technology

PIC18F87J10 FAMILY
15.2 Timer4 Interrupt
The Timer4 module has an 8-bit period register, PR4,
which is both readable and writable. Timer4 increments
from 00h until it matches PR4 and then resets to 00h on
the next increment cycle. The PR4 register is initialized
to FFh upon Reset.
FIGURE 15-1:
TIMER4 BLOCK DIAGRAM
15.3 Output of TMR4
The output of TMR4 (before the postscaler) is used
only as a PWM time base for the CCP modules. It is not
used as a baud rate clock for the MSSP as is the
Timer2 output.
4
T4OUTPS3:T4OUTPS0
2
T4CKPS1:T4CKPS0
FOSC/4
1:1, 1:4, 1:16
Prescaler
Internal Data Bus
Reset
TMR4
8
1:1 to 1:16
Postscaler
TMR4/PR4
Match
Comparator
8
Set TMR4IF
TMR4 Output
(to PWM)
PR4
8
TABLE 15-1: REGISTERS ASSOCIATED WITH TIMER4 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
49
IPR3
SSP2IP BCL2IP RC2IP
TX2IP TMR4IP CCP5IP CCP4IP CCP3IP 51
PIR3
SSP2IF BCL2IF RC2IF
TX2IF TMR4IF CCP5IF CCP4IF CCP3IF 51
PIE3
SSP2IE BCL2IE RC2IE
TX2IE TMR4IE CCP5IE CCP4IE CCP3IE 51
TMR4 Timer4 Register
53
T4CON
— T4OUTPS3 T4OUTPS2 T4OUTPS1 T4OUTPS0 TMR4ON T4CKPS1 T4CKPS0 53
PR4 Timer4 Period Register
53
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the Timer4 module.
DS39663A-page 158
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