PIC18F4685-E/PT Microchip Technology, PIC18F4685-E/PT Datasheet - Page 271
![96KB, Flash, 3328bytes-RAM, 36I/O, 8-bit Family,nanoWatt,ECAN 44 TQFP 10x10x1mm](/photos/6/82/68251/c04-076_pt_sml.jpg)
PIC18F4685-E/PT
Manufacturer Part Number
PIC18F4685-E/PT
Description
96KB, Flash, 3328bytes-RAM, 36I/O, 8-bit Family,nanoWatt,ECAN 44 TQFP 10x10x1mm
Manufacturer
Microchip Technology
Series
PIC® 18Fr
Datasheets
1.PCM18XT0.pdf
(484 pages)
2.PIC18F2221-ISO.pdf
(46 pages)
3.PIC18F2682-ISP.pdf
(6 pages)
4.PIC18F2682-ISP.pdf
(4 pages)
Specifications of PIC18F4685-E/PT
Core Processor
PIC
Core Size
8-Bit
Speed
40MHz
Connectivity
CAN, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, HLVD, POR, PWM, WDT
Number Of I /o
36
Program Memory Size
96KB (48K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
3.25K x 8
Voltage - Supply (vcc/vdd)
4.2 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
I3-DB18F4680 - BOARD DAUGHTER ICEPIC3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
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Manufacturer:
MICROCHIP
Quantity:
2 000
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Part Number:
PIC18F4685-E/PT
Manufacturer:
Microchip Technology
Quantity:
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Part Number:
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Manufacturer:
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Quantity:
20 000
- PCM18XT0 PDF datasheet
- PIC18F2221-ISO PDF datasheet #2
- PIC18F2682-ISP PDF datasheet #3
- PIC18F2682-ISP PDF datasheet #4
- Current page: 271 of 484
- Download datasheet (9Mb)
22.2
The following steps are needed to set up the HLVD
module:
1.
2.
3.
4.
5.
6.
22.3
When the module is enabled, the HLVD comparator
and voltage divider are enabled and will consume static
current. The total current consumption, when enabled,
is specified in electrical specification parameter D022B.
FIGURE 22-2:
© 2009 Microchip Technology Inc.
Disable the module by clearing the HLVDEN bit
(HLVDCON<4>).
Write the value to the HLVDL3:HLVDL0 bits that
select the desired HLVD trip point.
Set the VDIRMAG bit to detect high voltage
(VDIRMAG = 1) or low voltage (VDIRMAG = 0).
Enable the HLVD module by setting the
HLVDEN bit.
Clear the HLVD interrupt flag (PIR2<2>), which
may have been set from a previous interrupt.
Enable the HLVD interrupt if interrupts are
desired by setting the HLVDIE and GIE bits
(PIE<2> and INTCON<7>). An interrupt will not
be generated until the IRVST bit is set.
CASE 1:
CASE 2:
Enable HLVD
Enable HLVD
HLVD Setup
Current Consumption
HLVDIF
HLVDIF
IRVST
IRVST
V
V
DD
DD
LOW-VOLTAGE DETECT OPERATION (VDIRMAG = 0)
Internal Reference is stable
PIC18F2682/2685/4682/4685
Internal Reference is stable
T
T
IRVST
IRVST
HLVDIF may not be set
HLVDIF cleared in software,
HLVDIF remains set since HLVD condition still exists
Depending on the application, the HLVD module does
not need to be operating constantly. To decrease the
current requirements, the HLVD circuitry may only
need to be enabled for short periods where the voltage
is checked. After doing the check, the HLVD module
may be disabled.
22.4
The internal reference voltage of the HLVD module,
specified in electrical specification parameter D420,
may be used by other internal circuitry, such as the
Programmable Brown-out Reset. If the HLVD or other
circuits using the voltage reference are disabled to
lower the device’s current consumption, the reference
voltage circuit will require time to become stable before
a low or high-voltage condition can be reliably
detected. This start-up time, T
is independent of device clock speed. It is specified in
electrical specification parameter 36.
The HLVD interrupt flag is not enabled until T
expired and a stable reference voltage is reached. For
this reason, brief excursions beyond the set point may
not be detected during this interval. Refer to Figure 22-2
or Figure 22-3.
HLVD Start-up Time
HLVDIF cleared in software
HLVDIF cleared in software
IRVST
V
V
LVD
DS39761C-page 271
, is an interval that
LVD
IRVST
has
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