PIC18F86K90-I/PT Microchip Technology, PIC18F86K90-I/PT Datasheet - Page 405

• Manufacturer Part Number: PIC18F86K90-I/PT
• Description: 64kB Flash, 4kB RAM, 1kB EE, 16MIPS, NanoWatt XLP, LCD, 5V 80 TQFP 12x12x1mm TRA
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F86K90-I/PT

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 69
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 4K 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

27.0
The Charge Time Measurement Unit (CTMU) is a
flexible analog module that provides accurate differen-
tial time measurement between pulse sources, as well
as asynchronous pulse generation. By working with
other on-chip analog modules, the CTMU can precisely
measure time, capacitance and relative changes in
capacitance or generate output pulses with a specific
time delay. The CTMU is ideal for interfacing with
capacitive-based sensors.
The module includes these key features:
• Up to 24 channels available for capacitive or time
• On-chip precision current source
• Four-edge input trigger sources
• Polarity control for each edge source
• Control of edge sequence
FIGURE 27-1:
 2010 Microchip Technology Inc.
measurement input
CTEDG1
CTEDG2
CHARGE TIME
MEASUREMENT UNIT (CTMU)
ECCP2
ECCP1
CTMU BLOCK DIAGRAM
EDGEN
EDGSEQEN
EDG1SELx
EDG1POL
EDG2SELx
EDG2POL
Control
Edge
Logic
EDG1STAT
EDG2STAT
A/D Converter
Preliminary
Current Source
CTMUICON
CTMUCON
Current
Control
PIC18F87K90 FAMILY
Comparator 2
Input
ITRIM<5:0>
IRNG<1:0>
• Control of response to edges
• Time measurement resolution of 1 nanosecond
• High-precision time measurement
• Time delay of external or internal signal
• Accurate current source suitable for capacitive
The CTMU works in conjunction with the A/D Converter
to provide up to 24 channels for time or charge
measurement, depending on the specific device and
the number of A/D channels available. When config-
ured for time delay, the CTMU is connected to one of
the analog comparators. The level-sensitive input edge
sources can be selected from four sources: two
external inputs or the ECCP1/ECCP2 Special Event
Triggers.
The CTMU special event can trigger the Analog-to-Digital
Converter module.
Figure 27-1 provides a block diagram of the CTMU.
asynchronous to system clock
measurement
Comparator 2 Output
Generator
Control
CTMU
Logic
Pulse
TGEN
IDISSEN
CTTRIG
DS39957B-page 405
A/D Trigger
CTPLS