AT91SAM9G45-CU-999 Atmel, AT91SAM9G45-CU-999 Datasheet - Page 308

• Manufacturer Part Number: AT91SAM9G45-CU-999
• Description: IC MCU ARM9 APMC 324TFBGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM9G45-CU-999

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 400MHz
• Connectivity: EBI/EMI, Ethernet, I²C, IrDA, MMC, SPI, SSC, UART/USART, USB
• Peripherals: AC'97, DMA, I²S, LCD, POR, PWM, WDT
• Number Of I /o: 160
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: ROM
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 0.9 V ~ 1.1 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 324-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

25.10 Clock Switching Details
25.10.1
308
AT91SAM9G45
Master Clock Switching Timings
Table 25-1
selected clock to another one. This is in the event that the prescaler is de-activated. When the
prescaler is activated, an additional time of 64 clock cycles of the new selected clock has to be
added.
Table 25-1.
To
Main Clock
SLCK
PLLA Clock
Peripheral clock 4 is disabled.
write_register(PMC_PCDR,0x00000010)
From
gives the worst case timings required for the Master Clock to switch from one
Clock Switching Timings (Worst Case)
PLLACOUNT x SLCK +
0.5 x Main Clock +
0.5 x Main Clock +
2.5 x PLLAx Clock
Main Clock
4.5 x SLCK
4 x SLCK +
–
PLLACOUNT x SLCK
2.5 x PLLA Clock +
2.5 x Main Clock
4 x SLCK +
5 x SLCK +
SLCK
–
PLLACOUNT x SLCK
2.5 x PLLA Clock +
3 x PLLA Clock +
3 x PLLA Clock +
1 x Main Clock
6438F–ATARM–21-Jun-10
PLLA Clock
4 x SLCK +
4 x SLCK +
5 x SLCK