PIC10F200/202/204/206
To change the prescaler from the WDT to the Timer0
module, use the sequence shown in Example 6-2. This
sequence must be used even if the WDT is disabled. A
CLRWDT instruction should be executed before
switching the prescaler.
EXAMPLE 6-2:
CHANGING PRESCALER
(WDT→TIMER0)
;Clear WDT and
;prescaler
CLRWDT
MOVLW ‘xxxx0xxx’ ;Select TMR0, new
;prescale value and
;clock source
OPTION
FIGURE 6-5:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
TCY (= FOSC/4)
Data Bus
0
1
8
(2)
GP2/T0CKI
Pin
M
U
X
1
0
M
U
X
Sync
2
Cycles
TMR0 Reg
(1)
(1)
T0SE
T0CS
(1)
PSA
0
1
8-bit Prescaler
M
U
X
8
Watchdog
Timer
(1)
8-to-1 MUX
PS<2:0>
(1)
PSA
1
0
WDT Enable bit
(1)
MUX
PSA
WDT
Time-out
Note 1: T0CS, T0SE, PSA, PS<2:0> are bits in the OPTION register.
2: T0CKI is shared with pin GP2 on the PIC10F200/202/204/206.
DS41239D-page 32
© 2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
