PIC18F64J11T-I/PT Microchip Technology, PIC18F64J11T-I/PT Datasheet - Page 129

• Manufacturer Part Number: PIC18F64J11T-I/PT
• Description: 16KB, Flash, 1024bytes-RAM, 51I/O, 8-bit Family,nanoWatt 64 TQFP 10x10x1mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F64J11T-I/PT

• 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: 51
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MA180018 - MODULE PLUG-IN 18F85J11AC162079 - HEADER MPLAB ICD2 18F85J90 64/80AC164327 - MODULE SKT FOR 64TQFP
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PIC18F64J11T-I/PTTR

11.0
Depending on the device selected and features
enabled, there are up to nine ports available. Some
pins of the I/O ports are multiplexed with an alternate
function from the peripheral features on the device. In
general, when a peripheral is enabled, that pin may not
be used as a general purpose I/O pin.
Each port has three memory mapped registers for its
operation:
• TRIS register (Data Direction register)
• PORT register (reads the levels on the pins of the
• LAT register (Output Latch register)
Reading the PORT register reads the current status of
the pins, whereas writing to the PORT register writes to
the Output Latch (LAT) register.
Setting a TRIS bit (= 1) makes the corresponding
PORT pin an input (i.e., put the corresponding output
driver in a High-Impedance mode). Clearing a TRIS bit
(= 0) makes the corresponding PORT pin an output
(i.e., put the contents of the corresponding LAT bit on
the selected pin).
The Output Latch (LAT register) is useful for
read-modify-write operations on the value that the I/O
pins are driving. Read-modify-write operations on the
LAT register read and write the latched output value for
the PORT register.
A simplified model of a generic I/O port, without the
interfaces to other peripherals, is shown in Figure 11-1.
FIGURE 11-1:
 2010 Microchip Technology Inc.
device)
RD LAT
Data
Bus
WR LAT
or PORT
WR TRIS
RD TRIS
RD PORT
I/O PORTS
TRIS Latch
Data Latch
D
D
CK
CK
GENERIC I/O PORT
OPERATION
Q
Q
Q
EN
EN
D
I/O pin
Buffer
Input
(1)
PIC18F85J11 FAMILY
11.1
When developing an application, the capabilities of the
port pins must be considered. Outputs on some pins
have higher output drive strength than others. Similarly,
some pins can tolerate higher than V
11.1.1
The voltage tolerance of pins used as device inputs is
dependent on the pin’s input function. Most pins that are
used as digital only inputs are able to handle DC
voltages up to 5.5V, a level typical for digital logic
circuits. The digital pins that cannot exceed V
RE0, RE1, RE2, RG0, RG2 and RG3.
In contrast, pins that also have analog input functions of
any kind can only tolerate voltages up to V
excursions beyond V
Table 11-1 summarizes the input voltage capabilities.
Refer to Section 26.0 “Electrical Characteristics” for
more details.
TABLE 11-1:
11.1.2
When used as digital I/O, the output pin drive strengths
vary for groups of pins intended to meet the needs for
a variety of applications. In general, there are three
classes of output pins in terms of drive capability.
PORTB and PORTC, as well as PORTA<7:6>, are
designed to drive higher current loads, such as LEDs.
PORTD, PORTE and PORTJ are capable of driving
digital circuits associated with external memory
devices. They can also drive LEDs, but only those with
smaller current requirements. PORTF, PORTG and
PORTH, along with PORTA<5:0>, have the lowest
drive level, but are capable of driving normal digital
circuit loads with a high input impedance.
PORTA<7:5>
PORTA<3:0>
PORTC<1:0>
PORTE<2:0>
PORTF<7:1>
PORTG<3:2,0>
PORTA<4>
PORTB<7:0>
PORTC<7:2>
PORTD<7:0>
PORTE<7:3>
PORTG<4,1>
PORTH<7:0>
PORTJ<7:0>
Note 1:
Port or Pin
I/O Port Pin Capabilities
Not available on 64-pin devices.
INPUT PINS AND VOLTAGE
CONSIDERATIONS
PIN OUTPUT DRIVE
(1)
(1)
INPUT VOLTAGE TOLERANCE
Tolerated
DD
Input
5.5V
V
on these pins should be avoided.
DD
Only V
tolerated.
Tolerates input levels
above V
most standard logic.
DS39774D-page 129
Description
DD
DD
DD
input levels.
input levels
, useful for
DD
. Voltage
DD
are