AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 266

• Manufacturer Part Number: AT91RM9200-CI-002
• Description: IC ARM9 MCU 256 BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-CI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

23.4.5
23.4.5.1
23.4.5.2
23.4.5.3
266
AT91RM9200
Main Oscillator
Main Oscillator Connections
Main Oscillator Startup Time
Main Oscillator Control
Figure 23-4
Figure 23-4. Main Oscillator Block Diagram
The Clock Generator integrates a Main Oscillator that is designed for a 3 to 20 MHz fundamental
crystal. The typical crystal connection is illustrated in
required for crystals with frequencies lower than 8 MHz. The oscillator contains internal capaci-
tors on each XIN and XOUT pin. For further details on the electrical characteristics of the Main
Oscillator, see the section “AT91RM9200 Electrical Characteristics”.
Figure 23-5. Typical Crystal Connection
The startup time of the Main Oscillator is given in the DC Characteristics section of the product
datasheet. The startup time depends on the crystal frequency and decreases when the fre-
quency rises.
To minimize the power required to start up the system, the Main Oscillator is disabled after reset
and the Slow Clock mode is selected.
shows the Main Oscillator block diagram.
XIN
XOUT
Clock
Slow
C
L1
XIN
OSCOUNT
Main Clock
MOSCEN
Frequency
Oscillator
Oscillator
Counter
Counter
Main
XOUT
Main
C
L2
1K
Figure
Clock
Main
MAINRDY
23-5. The 1 k
MOSCS
MAINF
GNDOSC
1768I–ATARM–09-Jul-09
Ω
resistor is only