M42800A Atmel Corporation, M42800A Datasheet - Page 60

• Manufacturer Part Number: M42800A
• Manufacturer: Atmel Corporation

Specifications of M42800A

• Flash (kbytes): 0 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 33 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 54
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.3/5.0
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

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AT91M42800A
When a peripheral clock is disabled, the clock is immediately stopped. When the clock is re-
enabled, the peripheral resumes action where it left off. The peripheral clocks are automati-
cally disabled after a reset.
In order to stop a peripheral, it is recommended that the system software waits until the periph-
eral has executed its last programmed operation before disabling the clock. This is to avoid
data corruption or erroneous behavior of the system.
Note:
Figure 12-8. Peripheral Clock Control
The bits defined to control the Peripheral Clocks correspond to the bits controlling the Interrupt
Sources in the Interrupt Controller.
MCK
Master Clock
PMC_PCER
PMC_PCDR
PMC_PCSR
Set
Clear
Y
X
Peripheral
Clock Y
Peripheral
Clock X
1779D–ATARM–14-Apr-06