PIC12CE519-04/SN Microchip Technology, PIC12CE519-04/SN Datasheet - Page 494

• Manufacturer Part Number: PIC12CE519-04/SN
• Description: IC MCU OTP 1KX12 W/EE 8SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 12Cr

Specifications of PIC12CE519-04/SN

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 5
• Program Memory Size: 1.5KB (1K x 12)
• Program Memory Type: OTP
• Eeprom Size: 16 x 8
• Ram Size: 41 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (3.9mm Width)
• For Use With: ISPICR1 - ADAPTER IN-CIRCUIT PROGRAMMING309-1046 - ADAPTER 8-SOIC TO 8-DIP309-1045 - ADAPTER 8-SOIC TO 8-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Connectivity: -

PICmicro MID-RANGE MCU FAMILY
26.6
DS31026A-page 26-10
Design Tips
Question 1:
Answer 1:
The WDT was not designed to be a recovery from a brown-out condition. It was designed to
recover from errant software operation (the device remaining in the specified operating ranges).
If your system can be subjected to brown-outs, either the on-chip brown-out circuitry should be
enabled or an external brown-out circuit should be implemented.
Question 2:
Answer 2:
Make sure that the loop with the CLRWDT instruction meets the minimum specification of the WDT
(not the typical).
Question 3:
Answer 3:
On power-up, you must take into account the Oscillator Start-up time (Tost). Sometimes it helps
to put the CLRWDT instruction at the beginning of the loop, since this start-up time may be variable.
My system voltage drops and then returns to the specified device voltage
range. The device is not operating correctly and the WDT does not reset and
return the device to proper operation.
Device resets even though I do the CLRWDT instruction in my loop.
Device never gets out of resets.
1997 Microchip Technology Inc.