PIC18FXX39 Datasheet, PDF (103/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
11.0 TIMER1 MODULE
The Timer1 module timer/counter has the following
features:
• 16-bit timer/counter
(two 8-bit registers, TMR1H and TMR1L)
• Readable and writable (both registers)
• Internal or external clock select
• Interrupt-on-overflow from FFFFh to 0000h
Figure 11-1 is a simplified block diagram of the Timer1
module.
Register 11-1 details the Timer1 control register, which
sets the Operating mode of the Timer1 module. Timer1
can be enabled or disabled by setting or clearing
control bit TMR1ON (T1CON<0>).
REGISTER 11-1: T1CON: TIMER1 CONTROL REGISTER
R/W-0
RD16
bit 7
U-0
R/W-0
R/W-0
U-0
— T1CKPS1 T1CKPS0
—
R/W-0
T1SYNC
R/W-0
TMR1CS
R/W-0
TMR1ON
bit 0
bit 7
bit 6
bit 5-4
bit 3
bit 2
bit 1
bit 0
RD16: 16-bit Read/Write Mode Enable bit
1 = Enables register read/write of Timer1 in one 16-bit operation
0 = Enables register read/write of Timer1 in two 8-bit operations
Unimplemented: Read as '0'
T1CKPS1:T1CKPS0: Timer1 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
Unimplemented: Maintain as '0'
T1SYNC: Timer1 External Clock Input Synchronization Select bit
When TMR1CS = 1:
1 = Do not synchronize external clock input
0 = Synchronize external clock input
When TMR1CS = 0:
This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.
TMR1CS: Timer1 Clock Source Select bit
1 = External clock from pin RC0/T13CKI (on the rising edge)
0 = Internal clock (FOSC/4)
TMR1ON: Timer1 On bit
1 = Enables Timer1
0 = Stops Timer1
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
 2002-2013 Microchip Technology Inc.
Preliminary
DS30485B-page 103