Atmel AT91SAM7A2-EK, Руководство пользователя

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3-2 AT91SAM7A2-EK Evaluation Board User Guide
6115B–ATARM–10-May-05
3.4 Application
Interface
The board provides the following application interfaces:
3.5 Serial
Communication
Ports
The AT91SAM7A2-EK can control:
!
Four CAN buses
!
Two LIN buses
!
One RS-232 line
3.6 CAN Bus
The CAN0 module is connected to a 5 x 2 connector (J2) on a 0.1” (2.54 mm) pitch via
the CAN driver MN2.
The CAN1 and CAN2 modules are connected to two female SubD9 connectors (J5 and
J6) via the CAN drivers MN3 and MN4. CAN3 is connected to one male SubD9 connec-
tor (J7) via the CAN driver MN5. The pinout is described in Table 3-2.
Table 3-1. Board Application Interfaces
Part Description
Reset push button
Detects and then resets the board when the
3.3V supply voltage drops below 2.7V. Allows
manual reset of both board and
microcontroller.
Red LED DS2
Connected to timer (or I/O) pin TIOA0 (GPT
module)
Orange LED DS3
Connected to timer (or I/O) pin TIOA1 (GPT
module)
Green LED DS4
Connected to timer (or I/O) pin TIOB0 (GPT
module)
SW2 push button
SW3 push button
Connected to input pins TIOA2 and TIOB1 (or
I/O) of the timer (GPT module)
SW4 push button
Connected to GIC (Generic Interrupt
Controller) module IRQ0 input. Allows the
user to generate interrupts manually.
Buzzer
Connected to the PWM0 output. It
demonstrates the PWM (Pulse Width
Modulation) features. It is possible to
enable/disable the buzzer by opening/closing
jumper J10. The PWM0 output signal can be
a 3V3 or 5V (jumper J3). The voltage
influences the volume of the sound.
LCD connected to PIO
Displays 2 lines of 16 characters each. The
LCD is driven by the PIO which can be
powered by 3V3 or 5V. The LCD tolerates
these two voltages. Users can display
messages on the LCD. The contrast voltage is
provided by the PWM1 and can be measured
by ADC0 channel 0.