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:
CLRWDT
MOVLW
‘xxxx0xxx’
CHANGING PRESCALER
(WDT→TIMER0)
;Clear WDT and
;prescaler
;Select TMR0, new
;prescale value and
;clock source
OPTION
FIGURE 6-5:
BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER
T
CY
(= F
OSC
/4)
GP2/T0CKI
(2)
Pin
0
M
U
X
1
0
T0SE
(1)
T0CS
(1)
M
U
X
Sync
2
Cycles
TMR0 Reg
Data Bus
8
1
PSA
(1)
0
M
U
X
8-bit Prescaler
8
8-to-1 MUX
PS<2:0>
(1)
Watchdog
Timer
1
PSA
(1)
WDT Enable bit
0
MUX
1
PSA
(1)
WDT
Time-out
Note 1:
2:
T0CS, T0SE, PSA, PS<2:0> are bits in the OPTION register.
T0CKI is shared with pin GP2 on the PIC10F200/202/204/206.
DS41239D-page 32
©
2007 Microchip Technology Inc.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
