PIC16F54-I/P Microchip Technology Inc., PIC16F54-I/P Datasheet - Page 25

• Manufacturer Part Number: PIC16F54-I/P
• Description: 18 PIN, 768 B FLASH, 25 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F54-I/P

• Cpu Speed: 5 MIPS
• Eeprom Memory: 0 Bytes
• Frequency: 20 MHz
• Input Output: 12
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin PDIP
• Programmable Memory: 750 Bytes
• Ram Size: 25 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

5.0
The PIC16F5X devices may be reset in one of the
following ways:
• Power-on Reset (POR)
• MCLR Reset (normal operation)
• MCLR Wake-up Reset (from Sleep)
• WDT Reset (normal operation)
• WDT Wake-up Reset (from Sleep)
Table 5-1 shows these Reset conditions for the PCL
and Status registers.
Some registers are not affected in any Reset condition.
Their status is unknown on POR and unchanged in any
other Reset. Most other registers are reset to a “Reset
state” on Power-on Reset (POR), MCLR or WDT
Reset. A MCLR or WDT wake-up from Sleep also
results in a device Reset and not a continuation of
operation before Sleep.
TABLE 5-1:
TABLE 5-2:
 2004 Microchip Technology Inc.
Power-on Reset
MCLR Reset (normal operation)
MCLR Wake-up (from Sleep)
WDT Reset (normal operation)
WDT Wake-up (from Sleep)
Legend: u = unchanged, x = unknown, — = unimplemented read as ‘0’.
03h
Legend: u = unchanged, x = unknown, q = see Table 5-1 for possible values.
Address
RESET
STATUS
Name
STATUS BITS AND THEIR SIGNIFICANCE
SUMMARY OF REGISTERS ASSOCIATED WITH RESET
Bit 7
PA2
Condition
Bit 6
PA1
Bit 5
PA0
Bit 4
TO
Bit 3
PD
The TO and PD bits (Status <4:3>) are set or cleared
depending on the different Reset conditions (Table 5-1).
These bits may be used to determine the nature of the
Reset.
Table 5-3 lists a full description of Reset states of all
registers. Figure 5-1 shows a simplified block diagram
of the on-chip Reset circuit.
Bit 2
Z
Bit 1
DC
TO
1
u
1
0
0
Bit 0
C
0001 1xxx 000q quuu
Value on
PIC16F5X
POR
DS41213C-page 23
PD
1
u
0
1
0
WDT Reset
MCLR and
Value on