PIC18F85K22-I/PT Microchip Technology, PIC18F85K22-I/PT Datasheet - Page 380

• Manufacturer Part Number: PIC18F85K22-I/PT
• Description: IC, 8BIT MCU, PIC18F, 64MHZ, TQFP-80
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F85K22-I/PT

• Controller Family/series: PIC18
• No. Of I/o's: 69
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 64MHz
• No. Of Timers: 8
• Core Size: 8 Bit
• Program Memory Size: 32KB
• Core Processor: PIC
• Speed: 64MHz
• Connectivity: EBI/EMI, I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 24x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC18F87K22 FAMILY
The module is enabled by setting the HLVDEN bit
(HLVDCON<4>). Each time the HLVD module is
enabled, the circuitry requires some time to stabilize.
The IRVST bit (HLVDCON<5>) is a read-only bit used
to indicate when the circuit is stable. The module can
only generate an interrupt after the circuit is stable and
IRVST is set.
The VDIRMAG bit (HLVDCON<7>) determines the
overall operation of the module. When VDIRMAG is
cleared, the module monitors for drops in V
predetermined set point. When the bit is set, the
module monitors for rises in V
26.1
When the HLVD module is enabled, a comparator uses
an internally generated voltage reference as the set
point. The set point is compared with the trip point,
where each node in the resistor divider represents a
FIGURE 26-1:
DS39960D-page 380
V
DD
Operation
Externally Generated
Trip Point
HLVDIN
HLVD MODULE BLOCK DIAGRAM (WITH EXTERNAL INPUT)
HLVDEN
BOREN
DD
above the set point.
V
DD
DD
below a
HLVDL<3:0>
reference module. The comparator then generates an
trip point voltage. The “trip point” voltage is the voltage
level at which the device detects a high or low-voltage
event, depending on the configuration of the module.
When the supply voltage is equal to the trip point, the
voltage tapped off of the resistor array is equal to the
internal reference voltage generated by the voltage
interrupt signal by setting the HLVDIF bit.
The trip point voltage is software programmable to any of
16 values. The trip point is selected by programming the
HLVDL<3:0> bits (HLVDCON<3:0>).
The HLVD module has an additional feature that allows
the user to supply the trip voltage to the module from an
external source. This mode is enabled when bits,
HLVDL<3:0>, are set to ‘ 1111 ’. In this state, the
comparator input is multiplexed from the external input
pin, HLVDIN. This gives users the flexibility of configur-
ing the High/Low-Voltage Detect interrupt to occur at
any voltage in the valid operating range.
Internal Voltage
1.024V Typical
Reference
HLVDEN
HLVDCON
Register
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VDIRMAG
HLVDIF
Set