PIC16F946 Datasheet, PDF (245/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
TABLE 19-4: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating Temperature -40°C ≤ TA ≤ +125°C
Param
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
30 TMCL MCLR Pulse Width (low)
2
—
— μs VDD = 5V, -40°C to +85°C
11
18
24 ms Extended temperature
31
TWDT Watchdog Timer Time-out
Period (No Prescaler)
10
17
25 ms VDD = 5V, -40°C to +85°C
10
17
30 ms Extended temperature
32
TOST Oscillation Start-up Timer
Period
— 1024 TOSC — — TOSC = OSC1 period
33* TPWRT Power-up Timer Period
28*
TBD
64
TBD
132* ms VDD = 5V, -40°C to +85°C
TBD ms Extended Temperature
34
TIOZ I/O High-impedance from
—
—
2.0 μs
MCLR Low or Watchdog Timer
Reset
BVDD Brown-out Reset Voltage
2.025
—
2.175 V
35 TBOR Brown-out Reset Pulse Width 100*
—
— μs VDD ≤ BVDD (D005)
Legend: TBD = To Be Determined
* These parameters are characterized but not tested.
† Data in ‘Typ’ column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
FIGURE 19-7:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
40
41
42
T1CKI
TMR0 or
TMR1
45
46
47
48
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 243