Mikroelektronika MikroE Development Kits MIKROE-996 Datenbogen
Produktcode
MIKROE-996
PIC18F87K22 FAMILY
DS39960D-page 212
2009-2011 Microchip Technology Inc.
REGISTER 16-1:
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
10
= Timer1 clock source depends on the SOSCEN bit:
SOSCEN = 0:
External clock from the T1CKI 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
External clock from the T1CKI 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
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
bit 2
TxSYNC:
Timerx External Clock Input Synchronization Control bit
(Not usable if the device clock comes from Timer1/Timer3.)
When TMRxCS<1:0> = 10:
1
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; Timer3 uses the internal clock.
This bit is ignored; Timer3 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
bit 0
TMRxON:
Timerx On bit
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.