AT91SAM7A1-EK Atmel, AT91SAM7A1-EK Datasheet - Page 15

• Manufacturer Part Number: AT91SAM7A1-EK
• Description: BOARD EVAL FOR AT91SAM7A1
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM7A1-EK

• Contents: Evaluation Board, Parallel Cable and CD-ROM
• Processor To Be Evaluated: AT91SAM7A1
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: AT91SAM7A1
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3.7
3.8
AT91SAM7A1-EK Evaluation Board User Guide
Crystal
Oscillators and
Clock
Distribution
Memory
Organization
Note:
The LIN interfaces are connected to two three-pin header connectors:
The pinout for the connector J19 used by the USART1 is described Table 3-8.
Table 3-8. J19 Pinout
Note:
The pin-out for the connector J4 used by the USART0 is described Table 3-9.
Table 3-9. J4 Pinout
Note:
Figure 3-2. Male DB9 Connector
For more details, refer to Figure 4-6.
The system clock is derived from a 6 MHz crystal oscillator mounted on-board. At reset,
the on-chip PLL-based frequency multiplier is disabled, using the frequency of the crys-
tal oscillator as the default master clock. The low-frequency clock used for the low-
power mode, the Watchtimer module and the Watchdog module can be leaded by a 32
kHz crystal oscillator or a division of the 6 MHz crystal oscillator. At reset, the low-fre-
quency clock is configured on the 32 kHz crystal oscillator mounted on-board.
For more details, refer to Figure 4-2.
The Flash memory is an AT49BV1614A (1Mx16-bit). Write-protection for half of the on-
board Flash memory is provided. Output 2 of Jumper J15 drives the address pin 20 of
the Flash.
To access the whole memory, put a jumper in J5: 1 - 2.
Connector J19
Connector J4
Depending on the strap configuration, either SubD9 pin 1 or 4 can be controlled
by UPIO or by USART0 pins.
The schematic of these connectors is the same as the one used by the CAN0
module (see Section 3.5).
1. Depends on the strap configuration.
1. Depends on the strap configuration.
J19 Pin
J4 Pin
1
2
3
1
2
3
LIN (Local Interconnect Network)
LIN (Local Interconnect Network)
1
6
Vs (8V - 18V)
Vs (8V - 18V)
2
Function
Function
Ground
7
Ground
3
8
4
9
5
AT91SAM7A1 Pin
AT91SAM7A1 Pin
TXD1/RXD1
TXD0/RXD0
6114A–ATARM–09/04
GND
GND
(1)
(1)
3-5