PIC18C801-I/L Microchip Technology, PIC18C801-I/L Datasheet - Page 210

• Manufacturer Part Number: PIC18C801-I/L
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,LDCC,84PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Cr

Specifications of PIC18C801-I/L

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Type: ROMless
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 84-PLCC
• Processor Series: PIC18C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 1.5 KB
• Interface Type: 3-Wire, I2C, SPI, USART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 47
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Development Tools By Supplier: DV164005, ICE4000, DV164136
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164310 - MODULE SKT FOR PM3 84PLCCXLT84L1 - SOCKET TRANSITION ICE 84PLCCAC174012 - MODULE SKT PROMATEII 84PLCC
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC18C801-I/LR; PIC18C801-I/LR; PIC18C801I/L

PIC18C601/801
19.2
The Watchdog Timer is a free running on-chip RC oscil-
lator, which does not require any external components.
This RC oscillator is separate from the RC oscillator of
the OSC1/CLKI pin. That means that the WDT will run,
even if the clock on the OSC1/CLKI and OSC2/CLKO
pins of the device has been stopped; for example, by
execution of a SLEEP instruction.
During normal operation, a WDT time-out generates a
device RESET (Watchdog Timer Reset). If the device is
in SLEEP mode, a WDT time-out causes the device to
wake-up and continue with normal operation (Watch-
dog Timer Wake-up). The TO bit in the RCON register
will be cleared upon a WDT time-out.
By default, the Watchdog Timer is disabled by configu-
ration to allow software control over Watchdog Timer
operation. If the WDT is enabled by configuration, soft-
ware execution may not disable this function. When the
Watchdog Timer is disabled by configuration, the
SWDTEN bit in the WDTCON register enables/
disables the operation of the WDT.
REGISTER 19-5:
DS39541A-page 210
Watchdog Timer (WDT)
bit 7-4
bit 3-1
bit 0
WDTCON REGISTER
bit 7
Unimplemented: Read as ’0’
SWDPS2:SWDPS0: Software Watchdog Timer Postscale Select bits
111 = 1:128
110 = 1:64
101 = 1:32
100 = 1:16
011 = 1:8
010 = 1:4
001 = 1:2
000 = 1:1
SWDTEN: Software Controlled Watchdog Timer Enable bit
1 = Watchdog Timer is on
0 = Watchdog Timer is turned off if it is not disabled
Legend:
R = Readable bit
- n = Value at POR
U-0
—
U-0
—
Advance Information
U-0
—
W = Writable bit
’1’ = Bit is set
U-0
—
The WDT time-out period values may be found in the
Electrical Specifications section under parameter #31.
Values for the WDT postscaler may be assigned by
using configuration bits WDPS<3:1> in CONFIG2H
register. If the Watchdog Timer is disabled by configu-
ration, values for the WDT postscaler may be assigned
using the SWDPS bits in the WDTCON register.
19.2.1
Register 19-5 shows the WDTCON register. This is a
readable and writable register. It contains control bits to
control the Watchdog Timer from user software. If the
Watchdog Timer is enabled by configuration, this regis-
ter setting is ignored.
Note 1: The CLRWDT and SLEEP instructions
SWDPS2
2: When a CLRWDT instruction is executed
R/W-0
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
CONTROL REGISTER
clear the WDT and the postscaler, if
assigned to the WDT, and prevent it from
timing out and generating a device
RESET condition.
and the prescaler is assigned to the WDT,
the prescaler count will be cleared, but
the prescaler assignment is not changed.
SWDPS1 SWDPS0 SWDTEN
R/W-0
2001 Microchip Technology Inc.
x = Bit is unknown
R/W-0
R/W-0
bit 0