AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 265

• 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: -

23.4.4
23.4.4.1
23.4.4.2
1768I–ATARM–09-Jul-09
Slow Clock Oscillator
Slow Clock Oscillator Connection
Slow Clock Oscillator Startup Time
Figure 23-2. Clock Generator Block Diagram
The Clock Generator integrates a low-power 32.768 kHz oscillator. The XIN32 and XOUT32
pins must be connected to a 32.768 kHz crystal. Two external capacitors must be wired as
shown in
Figure 23-3. Typical Slow Clock Oscillator Connection
The startup time of the Slow Clock Oscillator is given in the DC Characteristics section of the
product datasheet. As it is often higher than 500 ms and the processor requires an assertion of
the reset until it has stabilized, the user must implement an external reset supervisor covering
this startup time. However, this startup is only required in case of cold reset, i.e., in case of sys-
tem power-up. When a warm reset occurs, the length of the reset pulse may be much lower. For
further details, see
XOUT32
PLLRCA
PLLRCB
Figure
XIN32
XOUT
XIN
23-3.
Section 15. “AT91RM9200 Reset Controller” on page
C
Main Clock
Slow Clock
Frequency
Oscillator
Oscillator
L1
Counter
Main
XIN32
32.768 kHz
Crystal
Clock Generator
Divider A
Divider B
C
L2
XOUT32
PLL A
PLL B
GNDOSC
(optional)
/2
AT91RM9200
117.
Clock
SLCK
PLLA
PLLB
Slow
Clock
Clock
Main
Clock
265