PIC16F84A-20/P Microchip Technology Inc., PIC16F84A-20/P Datasheet - Page 33

• Manufacturer Part Number: PIC16F84A-20/P
• Description: 18 PIN, 1.75 KB FLASH, 68 RAM, 13 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F84A-20/P

• Cpu Speed: 5 MIPS
• Eeprom Memory: 64 Bytes
• Input Output: 13
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin PDIP
• Programmable Memory: 1.75K Bytes
• Ram Size: 68 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

6.10.2
It should also be taken into account that under worst
case conditions (V
WDT Prescaler), it may take several seconds before a
WDT time-out occurs.
FIGURE 6-11:
TABLE 6-7:
2007h Config. bits
81h
Legend: x = unknown. Shaded cells are not used by the WDT.
Note 1: See Register 6-1 for operation of the PWRTE bit.
Addr
2001 Microchip Technology Inc.
Note:
2: See Register 6-1 and Section 6.12 for operation of the code and data protection bits.
OPTION_REG RBPU INTEDG
WDT PROGRAMMING
CONSIDERATIONS
Name
PSA and PS2:PS0 are bits in the OPTION_REG register.
SUMMARY OF REGISTERS ASSOCIATED WITH THE WATCHDOG TIMER
DD
= Min., Temperature = Max., Max.
WATCHDOG TIMER BLOCK DIAGRAM
WDT Timer
Bit 7
Enable Bit
(2)
WDT
From TMR0 Clock Source
Bit 6
(2)
(Figure 5-2)
T0CS
•
Bit 5
(2)
0
1
PSA
T0SE
Bit 4
M
U
X
(2)
PWRTE
Bit 3
PSA
0
(1)
Time-out
MUX
WDTE
8 - to -1 MUX
WDT
Bit 2
PS2
Postscaler
•
FOSC1
1
8
Bit 1
PS1
PSA
To TMR0 (Figure 5-2)
FOSC0
Bit 0
PS0
PIC16F84A
PS2:PS0
1111 1111 1111 1111
Power-on
Value on
Reset
(2)
DS35007B-page 31
Value on all
RESETS
other