AC244027 Microchip Technology, AC244027 Datasheet - Page 111

• Manufacturer Part Number: AC244027
• Description: Processor Extension Pak (PIC16LF727-ICE) 200K Device Emulator - Debugger Accesso
• Manufacturer: Microchip Technology
• Series: -r

Specifications of AC244027

• Accessory Type: Debug Interface Module
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: PIC16F727

11.0
The Timer0 module is an 8-bit timer/counter with the
following features:
• 8-bit timer/counter register (TMR0)
• 8-bit prescaler (shared with Watchdog Timer)
• Programmable internal or external clock source
• Programmable external clock edge selection
• Interrupt on overflow
• TMR0 can be used to gate Timer1
Figure 11-1 is a block diagram of the Timer0 module.
11.1
The Timer0 module can be used as either an 8-bit timer
or an 8-bit counter.
11.1.1
The Timer0 module will increment every instruction
cycle, if used without a prescaler. 8-Bit Timer mode is
selected by clearing the T0CS bit of the OPTION
register.
FIGURE 11-1:
© 2009 Microchip Technology Inc.
WDTE
Cap. Sensing
T1GSS = 11
TMR1GE
Oscillator
T0CKI
F
OSC
TIMER0 MODULE
Timer0 Operation
/4
8-BIT TIMER MODE
T0XCS
0
1
T0SE
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
Low-Power
WDT OSC
T0CS
0
1
Divide by
512
PSA
0
1
Prescaler
PIC16F72X/PIC16LF72X
8-bit
8
PS<2:0>
When TMR0 is written, the increment is inhibited for
two instruction cycles immediately following the write.
11.1.2
In 8-Bit Counter mode, the Timer0 module will
increment on every rising or falling edge of the T0CKI
pin or the Capacitive Sensing Oscillator (CPSOSC)
signal.
8-Bit Counter Mode using the T0CKI pin is selected by
setting the T0CS bit in the OPTION register to ‘1’ and
resetting the T0XCS bit in the CPSCON0 register to ‘0’.
8-Bit Counter Mode using the Capacitive Sensing
Oscillator (CPSOSC) signal is selected by setting the
T0CS bit in the OPTION register to ‘1’ and setting the
T0XCS bit in the CPSCON0 register to ‘1’.
The rising or falling transition of the incrementing edge
for either input source is determined by the T0SE bit in
the OPTION register.
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.
8-BIT COUNTER MODE
PSA
PSA
1
0
1
0
Time-out
2 T
Sync
WDT
CY
Set Flag bit T0IF
Overflow to Timer1
DS41341E-page 111
on Overflow
Data Bus
8
TMR0