Datasheet

PIC16C55X
DS40143E-page 50 Preliminary  1996-2013 Microchip Technology Inc.
FIGURE 7-6: BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
T0CKI
T0SE
pin
M
U
X
CLKOUT (=Fosc/4)
SYNC
2
Tcy
TMR0 reg
8-bit Prescaler
8-to-1MUX
M
U
X
M U X
Watchdog
Timer
PSA
01
0
1
WDT
Timeout
PS0 - PS2
8
PSA
WDT Enable bit
M
U
X
0
1
0
1
Data Bus
Set flag bit T0IF
on Overflow
8
PSA
T0CS
Note 1: T0SE, T0CS, PSA, PS0-PS2 are bits in the OPTION register.