AT91SAM9XE256-CU Atmel, AT91SAM9XE256-CU Datasheet - Page 316

• Manufacturer Part Number: AT91SAM9XE256-CU
• Description: MCU ARM9 256K FLASH 217-BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM9XE256-CU

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 96
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 56K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 217-LFBGA
• Processor Series: AT91SAMx
• Core: ARM926EJ-S
• Data Bus Width: 32 bit
• Data Ram Size: 32 KB
• Interface Type: 2-Wire, EBI, I2S, SPI, USART
• Maximum Clock Frequency: 180 MHz
• Number Of Programmable I/os: 96
• Number Of Timers: 6
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JTRACE-ARM-2M, KSK-AT91SAM9XE-PL, MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: AT91SAM-ICE, AT91-ISP, AT91SAM9XE-EK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 4 Channel
• Package: 217LFBGA
• Device Core: ARM926EJ-S
• Family Name: 91S
• Maximum Speed: 180 MHz
• Operating Supply Voltage: 1.8|2.5|3.3 V
• For Use With: AT91SAM9XE-EK - KIT EVAL FOR AT91SAM9XEAT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

27.4
27.5
27.6
27.6.1
316
Slow Clock RC Oscillator
Slow Clock Selection
Main Oscillator
AT91SAM9XE128/256/512 Preliminary
Main Oscillator Connections
Figure 27-2. Typical Slow Clock Crystal Oscillator Connection
The user has to take into account the possible drifts of the RC Oscillator. More details are given
in the section “DC Characteristics” of the product datasheet.
The AT91SAM9XE128/256/512 slow clock can be generated either by an external 32,768 Hz
crystal or the on-chip RC oscillator.
The startup counter delay for the slow clock oscillator depends on the OSCSEL signal. The
32,768 Hz startup delay is 1200 ms whereas it is 200 µs for the internal RC oscillator. The pin
OSCSEL must be tied either to GNDBU or VDDBU for correct operation of the device.
Refer to the Slow Clock Selection table in the Electrical Characteristics section of the product
datasheet for the states of the OSCSEL signal.
Figure 27-3
Figure 27-3. Main Oscillator Block Diagram
The Clock Generator integrates a Main Oscillator that is designed for a
crystal. The typical crystal connection is illustrated in
shows the Main Oscillator block diagram.
Slow Clock
XOUT
SLCK
XIN
XIN32
32,768 Hz
Crystal
Main Clock
Frequency
OSCOUNT
Oscillator
MOSCEN
Oscillator
Counter
Counter
Main
Main
XOUT32
Figure
GNDBU
27-4. The 1 k
Main Clock
MAINCK
MAINRDY
MOSCS
MAINF
3 to 20
6254C–ATARM–22-Jan-10
Ω
MHz fundamental
resistor is only