PIC18F87K90 Datasheet, PDF (212/566 Pages) Microchip Technology – 64/80-Pin, High-Performance Microcontrollers with LCD Driver and nanoWatt XLP Technology

PIC18F87K90 FAMILY
REGISTER 16-1: TxCON: TIMER4/6/8/10/12 CONTROL REGISTER
U-0
—
bit 7
R/W-0
R/W-0
R/W-0
R/W-0
TxOUTPS3 TxOUTPS2 TxOUTPS1 TxOUTPS0
R/W-0
TMRxON
R/W-0
TxCKPS1
R/W-0
TxCKPS0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6-3
bit 2
bit 1-0
Unimplemented: Read as ‘0’
TxOUTPS<3:0>: Timerx Output Postscale Select bits
0000 = 1:1 Postscale
0001 = 1:2 Postscale
•
•
•
1111 = 1:16 Postscale
TMRxON: Timerx On bit
1 = Timerx is on
0 = Timerx is off
TxCKPS<1:0>: Timerx Clock Prescale Select bits
00 = Prescaler is 1
01 = Prescaler is 4
1x = Prescaler is 16
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.
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.
FIGURE 16-1:
TIMER4/6/8/10/12 BLOCK DIAGRAM
TxOUTPS<3:0>
TxCKPS<1:0>
FOSC/4
4
2
1:1, 1:4, 1:16
Prescaler
Internal Data Bus
Reset
TMRx
8
1:1 to 1:16
Postscaler
TMRx/PRx
Match
Comparator
8
Set TMRxIF
TMRx Output
(to PWM)
PRx
8
DS39957B-page 212
Preliminary
 2010 Microchip Technology Inc.