PIC18F252-E/SO Microchip Technology, PIC18F252-E/SO Datasheet - Page 205
![IC MCU CMOS 40MHZ 16K FLSH28SOIC](/photos/6/59/65909/150-28-soic_sml.jpg)
PIC18F252-E/SO
Manufacturer Part Number
PIC18F252-E/SO
Description
IC MCU CMOS 40MHZ 16K FLSH28SOIC
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC18F242-ISO.pdf
(332 pages)
3.PIC18F242-ISO.pdf
(14 pages)
4.PIC18F242-ISO.pdf
(16 pages)
5.PIC18F242-ISO.pdf
(16 pages)
6.PIC18F242-ISO.pdf
(14 pages)
Specifications of PIC18F252-E/SO
Core Size
8-Bit
Program Memory Size
32KB (16K x 16)
Core Processor
PIC
Speed
40MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, LVD, POR, PWM, WDT
Number Of I /o
23
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 5x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 125°C
Package / Case
28-SOIC (7.5mm Width)
Controller Family/series
PIC18
No. Of I/o's
23
Eeprom Memory Size
256Byte
Ram Memory Size
1.5KB
Cpu Speed
40MHz
No. Of Timers
4
Processor Series
PIC18F
Core
PIC
Data Bus Width
8 bit
Data Ram Size
1536 B
Interface Type
MSSP, SPI, I2C, PSP, USART
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
23
Number Of Timers
4
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
PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, ICE4000, DM163022, DV164136
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 5 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18F252-E/SO
Manufacturer:
MICROCHIP
Quantity:
53
- PIC16F616T-ISL PDF datasheet
- PIC18F242-ISO PDF datasheet #2
- PIC18F242-ISO PDF datasheet #3
- PIC18F242-ISO PDF datasheet #4
- PIC18F242-ISO PDF datasheet #5
- PIC18F242-ISO PDF datasheet #6
- Current page: 205 of 332
- Download datasheet (6Mb)
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/
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 19-14: WDTCON REGISTER
© 2006 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 configuration
Legend:
R = Readable bit
U = Unimplemented bit, read as ‘0’
U-0
—
register = ‘0’
U-0
—
U-0
—
U-0
The WDT time-out period values may be found in the
Electrical Specifications (Section 22.0) under parame-
ter D031. Values for the WDT postscaler may be
assigned using the configuration bits.
19.2.1
Register 19-14 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, only when the configuration bit has
disabled the WDT.
—
Note:
Note:
W = Writable bit
- n = Value at POR
The CLRWDT and SLEEP instructions clear
the WDT and the postscaler, if assigned to
the WDT and prevent it from timing out and
generating a device RESET condition.
When a CLRWDT instruction is executed
and the postscaler is assigned to the WDT,
the postscaler count will be cleared, but the
postscaler assignment is not changed.
CONTROL REGISTER
U-0
—
U-0
—
PIC18FXX2
U-0
—
DS39564C-page 203
SWDTEN
R/W-0
bit 0
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