AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 268

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-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: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

23.4.6
23.4.6.1
268
AT91RM9200
Divider and PLL Blocks
PLL Filters
The Clock Generator features two Divider/PLL Blocks that generates a wide range of frequen-
cies. Additionally, they provide a 48 MHz signal to the embedded USB device and/or host ports,
regardless of the frequency of the Main Clock.
Figure 23-6
Figure 23-6. Divider and PLL Blocks Block Diagram
The two PLLs require connection to an external second-order filter through the pins PLLRC.
ure 23-7
Figure 23-7. PLL Capacitors and Resistors
Values of R, C1 and C2 to be connected to the PLLRC pins must be calculated as a function of
the PLL input frequency, the PLL output frequency and the phase margin. A trade-off has to be
found between output signal overshoot and startup time.
shows a schematic of these filters.
shows the block diagram of the divider and PLL blocks.
Main
Clock
Slow
Clock
C2
Divider A
Divider B
DIVA
DIVB
C1
R
PLLRCA
PLLRCB
PLLRC
GND
MULA
MULB
PLLACOUNT
PLLBCOUNT
Counter
Counter
PLL B
PLL A
PLL A
PLL B
OUTA
OUTB
PLL
LOCKB
LOCKA
PLL B
Output
PLL A
Output
1768I–ATARM–09-Jul-09
Fig-