PIC18F452-I/P Microchip Technology Inc., PIC18F452-I/P Datasheet - Page 260
PIC18F452-I/P
Manufacturer Part Number
PIC18F452-I/P
Description
40 PIN, 32 KB FLASH, 1536 RAM, 34 I/O
Manufacturer
Microchip Technology Inc.
Datasheet
1.PIC18F452-IP.pdf
(390 pages)
Specifications of PIC18F452-I/P
A/d Inputs
8-Channel, 10-Bit
Comparators
2
Cpu Speed
10 MIPS
Eeprom Memory
256 Bytes
Input Output
36
Interface
I2C/SPI/USART
Memory Type
Flash
Number Of Bits
8
Package Type
40-pin PDIP
Programmable Memory
32K Bytes
Ram Size
1.5K Bytes
Speed
40 MHz
Timers
1-8-bit, 3-16-bit
Voltage, Range
2-5.5 V
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
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PIC18F2420/2520/4420/4520
23.2
For PIC18F2420/2520/4420/4520 devices, the WDT is
driven by the INTRC source. When the WDT is
enabled, the clock source is also enabled. The nominal
WDT period is 4 ms and has the same stability as the
INTRC oscillator.
The 4 ms period of the WDT is multiplied by a 16-bit
postscaler. Any output of the WDT postscaler is
selected by a multiplexer, controlled by bits in Configu-
ration Register 2H. Available periods range from 4 ms
to 131.072 seconds (2.18 minutes). The WDT and
postscaler are cleared when any of the following events
occur: a SLEEP or CLRWDT instruction is executed, the
IRCF bits (OSCCON<6:4>) are changed or a clock
failure has occurred.
FIGURE 23-1:
DS39631A-page 258
Change on IRCF bits
All Device Resets
INTRC Source
WDTPS<3:0>
Watchdog Timer (WDT)
SWDTEN
CLRWDT
WDTEN
Sleep
WDT BLOCK DIAGRAM
Enable WDT
WDT Counter
128
4
Preliminary
Programmable Postscaler
1:1 to 1:32,768
23.2.1
Register 23-14 shows the WDTCON register. This is a
readable and writable register which contains a control
bit that allows software to override the WDT enable
configuration bit, but only if the configuration bit has
disabled the WDT.
Note 1: The CLRWDT and SLEEP instructions
2: Changing the setting of the IRCF bits
3: When a CLRWDT instruction is executed,
CONTROL REGISTER
clear the WDT and postscaler counts
when executed.
(OSCCON<6:4>) clears the WDT and
postscaler counts.
the postscaler count will be cleared.
Reset
2004 Microchip Technology Inc.
WDT
Reset
Wake-up
from Power
Managed Modes
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