PIC18F4439T-E/ML Microchip Technology, PIC18F4439T-E/ML Datasheet - Page 205
![IC PIC MCU FLASH 6KX16 44QFN](/photos/6/81/68122/150-44-qfn_sml.jpg)
PIC18F4439T-E/ML
Manufacturer Part Number
PIC18F4439T-E/ML
Description
IC PIC MCU FLASH 6KX16 44QFN
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC18F2439-ISO.pdf
(322 pages)
3.PIC18F2439-ISO.pdf
(6 pages)
4.PIC18F2439-ISO.pdf
(34 pages)
Specifications of PIC18F4439T-E/ML
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
12KB (6K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
640 x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
44-QFN
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
640 B
Interface Type
I2C, SPI, AUSART
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
32
Number Of Timers
16 bit
Operating Supply Voltage
2 V to 5.5 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
Development Tools By Supplier
DV164005, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- PIC16F616T-ISL PDF datasheet
- PIC18F2439-ISO PDF datasheet #2
- PIC18F2439-ISO PDF datasheet #3
- PIC18F2439-ISO PDF datasheet #4
- Current page: 205 of 322
- Download datasheet (7Mb)
20.2
The Watchdog Timer is a free running on-chip RC
oscillator, which does not require any external compo-
nents. 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/RA6 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.
The Watchdog Timer is enabled/disabled by a device
configuration bit. If the WDT is enabled, software exe-
cution may not disable this function. When the WDTEN
configuration bit is cleared, the SWDTEN bit enables/
disables the operation of the WDT.
REGISTER 20-13: WDTCON REGISTER
2002 Microchip Technology Inc.
Watchdog Timer (WDT)
bit 7-1
bit 0
bit 7
Unimplemented: Read as ’0’
SWDTEN: Software Controlled Watchdog Timer Enable bit
1 = Watchdog Timer is on
0 = Watchdog Timer is turned off if the WDTEN configuration bit in the
Legend:
R = Readable bit
U = Unimplemented bit, read as ‘0’
U-0
—
configuration register = 0
U-0
—
U-0
Preliminary
—
U-0
—
The WDT time-out period values may be found in the
Electrical Specifications (Section 23.0) under parame-
ter D031. Values for the WDT postscaler may be
assigned using the configuration bits.
20.2.1
Register 20-13 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, only when the configuration bit has
disabled the WDT.
Note 1: The CLRWDT and SLEEP instructions
W = Writable bit
- n = Value at POR
2: When a CLRWDT instruction is executed
U-0
—
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 postscaler is assigned to the
WDT, the postscaler count will be cleared,
but the postscaler assignment is not
changed.
PIC18FXX39
U-0
—
U-0
—
DS30485A-page 203
SWDTEN
R/W-0
bit 0
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