PIC10F220-E/OT Microchip Technology, PIC10F220-E/OT Datasheet - Page 29

• Manufacturer Part Number: PIC10F220-E/OT
• Description: 384B Flash, 16B RAM, 4 I/O, 8bit ADC 6 SOT-23 BAG
• Manufacturer: Microchip Technology
• Series: PIC® 10Fr

Specifications of PIC10F220-E/OT

• Processor Series: PIC10F
• Core: RISC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 256 B
• Data Ram Size: 16 B
• Interface Type: RS-232, USB
• Maximum Clock Frequency: 8 MHZ
• Number Of Programmable I/os: 4
• Number Of Timers: 1
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23-6
• Operating Temperature Range: - 40 C to + 125 C
• Processor To Be Evaluated: PIC10F220
• Supply Current (max): 100 nA
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: -
• Peripherals: POR, WDT
• Number Of I /o: 4
• Eeprom Size: -
• Ram Size: 16 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Lead Free Status / Rohs Status: Details

6.1.2
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 mod-
ule is actually incremented. Figure 6-4 shows the delay
from the external clock edge to the timer incrementing.
FIGURE 6-4:
6.2
An 8-bit counter is available as a prescaler for the
Timer0 module or as a postscaler for the Watchdog
Timer (WDT), respectively (see Section 8.6 “Watch-
dog Timer (WDT)”). 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
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.
External Clock/Prescaler
Note:
External Clock Input or
Increment Timer0 (Q4)
Output After Sampling
Note 1: Delay from clock input change to Timer0 increment is 3T
Prescaler Output
to
Prescaler
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.
the
Therefore, the error in measuring the interval between two edges on Timer0 input = ±4T
TMR0
Timer0
TIMER0 TIMING WITH EXTERNAL CLOCK
(2)
register
(3)
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
(e.g.,
(1)
CLRF 1,
T0
OSC
to 7T
T0 + 1
PIC10F220/222
OSC
. (Duration of Q = T
T0 + 2
DS41270E-page 27
Small pulse
misses sampling
OSC
OSC
max.
).