Datasheet

PIC18(L)F2X/4XK22
DS41412F-page 172  2010-2012 Microchip Technology Inc.
12.13 Register Definitions: Timer1/3/5 Control
REGISTER 12-1: TXCON: TIMER1/3/5 CONTROL REGISTER
R/W-0/u R/W-0/u R/W-0/u R/W-0/u R/W-0/u R/W-0/u R/W-0/0 R/W-0/u
TMRxCS<1:0> TxCKPS<1:0> TxSOSCEN TxS
YNC TxRD16 TMRxON
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set ‘0’ = Bit is cleared
bit 7-6 TMRxCS<1:0>: Timer1/3/5 Clock Source Select bits
11 =Reserved. Do not use.
10 =Timer1/3/5 clock source is pin or oscillator:
If
TxSOSCEN = 0:
External clock from TxCKI pin (on the rising edge)
If TxSOSCEN = 1:
Crystal oscillator on SOSCI/SOSCO pins
01 =Timer1/3/5 clock source is system clock (FOSC)
00 =Timer1/3/5 clock source is instruction clock (F
OSC/4)
bit 5-4 TxCKPS<1:0>: Timer1/3/5 Input Clock Prescale Select bits
11 = 1:8 Prescale value
10 = 1:4 Prescale value
01 = 1:2 Prescale value
00 = 1:1 Prescale value
bit 3 TxSOSCEN: Secondary Oscillator Enable Control bit
1 = Dedicated Secondary oscillator circuit enabled
0 = Dedicated Secondary oscillator circuit disabled
bit 2 Tx
SYNC: Timer1/3/5 External Clock Input Synchronization Control bit
TMRxC
S<1:0> = 1X
1 = Do not synchronize external clock input
0 = Synchronize external clock input with system clock (F
OSC)
TMRxCS<1:0> = 0X
This bit is ignored. Timer1/3/5 uses the internal clock when TMRxCS<1:0> = 1X.
bit 1 TxRD16: 16-Bit Read/Write Mode Enable bit
1 = Enables register read/write of Timer1/3/5 in one 16-bit operation
0 = Enables register read/write of Timer1/3/5 in two 8-bit operation
bit 0 TMRxON: Timer1/3/5 On bit
1 = Enables Timer1/3/5
0 = Stops Timer1/3/5
Clears Timer1/3/5 Gate flip-flop