Microchip Technology DM183037 Data Sheet
2012 Microchip Technology Inc.
DS30575A-page 285
PIC18F97J94 FAMILY
REGISTER 15-1:
TxCON: TIMERx CONTROL REGISTER
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
TMRxCS1
TMRxCS0
TxCKPS1
TxCKPS0
SOSCEN
TxSYNC
RD16
TMRxON
bit 7
bit 0
Legend:
R = Readable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-6
TMRxCS<1:0>: Timerx Clock Source Select bits
11 = Timerx Clock source is INTOSC
10 = Timerx clock source depends on the SOSCEN bit:
SOSCEN = 0:
External clock from the TxCKI pin (on the rising edge).
SOSCEN = 1:
Depending on the SOSCSEL fuses, either a crystal oscillator on the SOSCI/SOSCO pins or an external
clock from the SCLKI pin.
01 = Timerx clock source is the system clock (F
11 = Timerx Clock source is INTOSC
10 = Timerx clock source depends on the SOSCEN bit:
SOSCEN = 0:
External clock from the TxCKI pin (on the rising edge).
SOSCEN = 1:
Depending on the SOSCSEL fuses, either a crystal oscillator on the SOSCI/SOSCO pins or an external
clock from the SCLKI pin.
01 = Timerx clock source is the system clock (F
OSC
)
00 = Timerx clock source is the instruction clock (F
OSC
/4)
bit 5-4
TxCKPS<1:0>: Timerx 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
11 = 1:8 Prescale value
10 = 1:4 Prescale value
01 = 1:2 Prescale value
00 = 1:1 Prescale value
bit 3
SOSCEN: SOSC Oscillator Enable bit
1 = SOSC/SCLKI are enabled for Timerx (based on the SOSCSEL fuses)
0 = SOSC/SCLKI are disabled for Timerx and TxCKI is enabled
1 = SOSC/SCLKI are enabled for Timerx (based on the SOSCSEL fuses)
0 = SOSC/SCLKI are disabled for Timerx and TxCKI is enabled
bit 2
TxSYNC: Timerx External Clock Input Synchronization Control bit
(Not usable if the device clock comes from Timer1/3/5.)
When TMRxCS<1:0> = 10:
1 = Do not synchronize external clock input
0 = Synchronize external clock input
When TMRxCS<1:0> = 0x:
This bit is ignored; Timer1/3/5 uses the internal clock.
(Not usable if the device clock comes from Timer1/3/5.)
When TMRxCS<1:0> = 10:
1 = Do not synchronize external clock input
0 = Synchronize external clock input
When TMRxCS<1:0> = 0x:
This bit is ignored; Timer1/3/5 uses the internal clock.
bit 1
RD16: 16-Bit Read/Write Mode Enable bit
1 = Enables register read/write of Timerx in one 16-bit operation
0 = Enables register read/write of Timerx in two eight-bit operations
1 = Enables register read/write of Timerx in one 16-bit operation
0 = Enables register read/write of Timerx in two eight-bit operations
bit 0
TMRxON: Timerx On bit
1 = Enables Timerx
0 = Stops Timerx
1 = Enables Timerx
0 = Stops Timerx
Note 1:
The F
OSC
clock source should not be selected if the timer will be used with the ECCP capture/compare
features.