PIC16LF1526 Datasheet, PDF (163/354 Pages) Microchip Technology – 64-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16(L)F1526/27
17.0 TIMER0 MODULE
The Timer0 module is an 8-bit timer/counter with the
following features:
• 8-bit timer/counter register (TMR0)
• 8-bit prescaler (independent of Watchdog Timer)
• Programmable internal or external clock source
• Programmable external clock edge selection
• Interrupt on overflow
• TMR0 can be used to gate Timer1/3/5
Figure 17-1 is a block diagram of the Timer0 module.
17.1 Timer0 Operation
The Timer0 module can be used as either an 8-bit timer
or an 8-bit counter.
17.1.1 8-BIT TIMER MODE
The Timer0 module will increment every instruction
cycle, if used without a prescaler. 8-Bit Timer mode is
selected by clearing the TMR0CS bit of the
OPTION_REG register.
When TMR0 is written, the increment is inhibited for
two instruction cycles immediately following the write.
Note:
The value written to the TMR0 register
can be adjusted, in order to account for
the two instruction cycle delay when
TMR0 is written.
17.1.2 8-BIT COUNTER MODE
In 8-Bit Counter mode, the Timer0 module will
increment on either the rising or falling edge of the
T0CKI pin. The edge that increments the counter is
determined by the TMR0SE bit in the OPTION_REG
register. TMR0SE = 1 selects the falling edge.
The 8-bit Counter mode using the T0CKI pin is selected
by setting the TMR0CS bit in the OPTION_REG register
to ‘1’.
FIGURE 17-1:
BLOCK DIAGRAM OF THE TIMER0
FOSC/4
T0CKI
0
1
TMR0SE _TMR0CS
8-bit
Prescaler
1
0
PSA
Sync
2 TCY
Data Bus
8
TMR0
Set Flag bit TMR0IF
on Overflow
Overflow to Timer1/3/5
8
PS<2:0>
 2011 Microchip Technology Inc.
Preliminary
DS41458A-page 163