PIC18C252/JW Microchip Technology, PIC18C252/JW Datasheet - Page 178
![IC MCU 16x16 A/D 28CDIP](/photos/7/29/72984/150-28-cdip_sml.jpg)
PIC18C252/JW
Manufacturer Part Number
PIC18C252/JW
Description
IC MCU 16x16 A/D 28CDIP
Manufacturer
Microchip Technology
Series
PIC® 18Cr
Datasheets
1.PIC16F616T-ISL.pdf
(8 pages)
2.PIC16C770-ISO.pdf
(8 pages)
3.PIC18C242-ISO.pdf
(305 pages)
4.PIC18C242-ISO.pdf
(12 pages)
Specifications of PIC18C252/JW
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
22
Program Memory Size
32KB (16K x 16)
Program Memory Type
EPROM, UV
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
0°C ~ 70°C
Package / Case
28-CDIP (0.300", 7.62mm) Window
For Use With
XLT28XP - SOCKET TRANSITION ICE 28DIP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC18C252/JW
Manufacturer:
MICROCHIP
Quantity:
4 000
- PIC16F616T-ISL PDF datasheet
- PIC16C770-ISO PDF datasheet #2
- PIC18C242-ISO PDF datasheet #3
- PIC18C242-ISO PDF datasheet #4
- Current page: 178 of 305
- Download datasheet (6Mb)
PIC18CXX2
17.2
Depending on the power source for the device voltage,
the voltage normally decreases relatively slowly. This
means that the LVD module does not need to be con-
stantly operating. To decrease the current require-
ments, the LVD circuitry only needs to be enabled for
short periods, where the voltage is checked. After
doing the check, the LVD module may be disabled.
Each time that the LVD module is enabled, the circuitry
requires some time to stabilize. After the circuitry has
stabilized, all status flags may be cleared. The module
will then indicate the proper state of the system.
FIGURE 17-4:
DS39026C-page 176
Internally Generated
Internally Generated
Reference stable
Reference stable
Operation
CASE 1:
CASE 2:
Enable LVD
Enable LVD
LVDIF
LVDIF
V
V
DD
DD
LOW VOLTAGE DETECT WAVEFORMS
50 ms
50 ms
LVDIF may not be set
The following steps are needed to set up the LVD module:
1.
2.
3.
4.
5.
6.
Figure 17-4 shows typical waveforms that the LVD
module may be used to detect.
LVDIF cleared in software,
LVDIF remains set since LVD condition still exists
Write the value to the LVDL3:LVDL0 bits (LVD-
CON register), which selects the desired LVD
Trip Point.
Ensure that LVD interrupts are disabled (the
LVDIE bit is cleared, or the GIE bit is cleared).
Enable the LVD module (set the LVDEN bit in
the LVDCON register).
Wait for the LVD module to stabilize (the IRVST
bit to become set).
Clear the LVD interrupt flag, which may have
falsely become set until the LVD module has
stabilized (clear the LVDIF bit).
Enable the LVD interrupt (set the LVDIE and the
GIE bits).
LVDIF cleared in software
2000 Microchip Technology Inc.
LVDIF cleared in software
V
V
LVD
LVD
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