PIC10F200-I/P Microchip Technology, PIC10F200-I/P Datasheet - Page 37

• Manufacturer Part Number: PIC10F200-I/P
• Description: IC PIC MCU FLASH 256X12 8DIP
• Manufacturer: Microchip Technology
• Series: PIC® 10Fr

Specifications of PIC10F200-I/P

• Program Memory Type: FLASH
• Program Memory Size: 384B (256 x 12)
• Package / Case: 8-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 3
• Ram Size: 16 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC10F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 16 B
• Interface Type: USB
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 4
• Number Of Timers: 1
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162059 - HEADER INTRFC MPLAB ICD2 8/14PINAC164037 - MODULE SKT 6L PROMATE II SOT23
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

7.1.2
Since the prescaler output is synchronized with the
internal clocks, there is a small delay from the time the
external clock edge occurs to the time the Timer0
module is actually incremented. Figure 7-4 shows the
delay from the external clock edge to the timer
incrementing.
FIGURE 7-4:
7.2
An 8-bit counter is available as a prescaler for the
Timer0 module or as a postscaler for the Watchdog
Timer (WDT), respectively (see Figure 9-6). For
simplicity, this counter is being referred to as
“prescaler” throughout this data sheet.
The PSA and PS<2:0> bits (OPTION<3:0>) determine
prescaler assignment and prescale ratio.
When assigned to the Timer0 module, all instructions
writing to the TMR0 register (e.g., CLRF 1, MOVWF 1,
BSF 1,x, etc.) will clear the prescaler. When assigned
to WDT, a CLRWDT instruction will clear the prescaler
along with the WDT. The prescaler is neither readable
nor writable. On a Reset, the prescaler contains all ‘0’s.
© 2007 Microchip Technology Inc.
Note:
Note 1: Delay from clock input change to Timer0 increment is 3 T
External Clock/Prescaler
External Clock Input or
Increment Timer0 (Q4)
Prescaler
Output After Sampling
2: External clock if no prescaler selected; prescaler output otherwise.
3: The arrows indicate the points in time where sampling occurs.
TIMER0 INCREMENT DELAY
The prescaler may be used by either the
Timer0 module or the WDT, but not both.
Thus, a prescaler assignment for the
Timer0 module means that there is no
prescaler for the WDT and vice versa.
Prescaler Output
in measuring the interval between two edges on Timer0 input = ±4 T
TIMER0 TIMING WITH EXTERNAL CLOCK
Timer0
(2)
(3)
Q1 Q2 Q3 Q4
(1)
Q1 Q2 Q3 Q4 Q1 Q2 Q3
T0
PIC10F200/202/204/206
7.2.1
The prescaler assignment is fully under software
control (i.e., it can be changed “on-the-fly” during pro-
gram execution). To avoid an unintended device Reset,
the following instruction sequence (Example 7-1) must
be executed when changing the prescaler assignment
from Timer0 to the WDT.
EXAMPLE 7-1:
To change the prescaler from the WDT to the Timer0
module, use the sequence shown in Example 7.2. This
sequence must be used even if the WDT is disabled. A
CLRWDT instruction should be executed before
switching the prescaler.
CLRWDT
CLRF
MOVLW
OPTION
CLRWDT
MOVLW
OPTION
OSC
to 7 T
TMR0
‘00xx1111’b ;These 3 lines (5, 6, 7)
‘00xx1xxx’b ;Set Postscaler to
OSC
T0 + 1
OSC
SWITCHING PRESCALER
ASSIGNMENT
(Duration of Q = T
max.
Q4 Q1 Q2 Q3 Q4
CHANGING PRESCALER
(TIMER0 → WDT)
;Clear WDT
;Clear TMR0 & Prescaler
;are required only if
;desired
;PS<2:0> are 000 or 001
;desired WDT rate
OSC
T0 + 2
Small pulse
misses sampling
). Therefore, the error
DS41239D-page 35