M42800A Atmel Corporation, M42800A Datasheet - Page 50
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M42800A
Manufacturer Part Number
M42800A
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(153 pages)
3.M42800A.pdf
(224 pages)
4.M42800A.pdf
(27 pages)
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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PS: Power-saving
Peripheral Clocks
50
AT91X40 Series
The AT91X40 Series’ Power-saving feature enables optimization of power consumption.
The PS controls the CPU and Peripheral Clocks. One control register (PS_CR) enables
the user to stop the ARM7TDMI Clock and enter Idle Mode. One set of registers with a
set/clear mechanism enables and disables the peripheral clocks individually.
The ARM7TDMI clock is enabled after a reset and is automatically re-enabled by any
enabled interrupt in the Idle Mode.
The clock of each peripheral integrated in the AT91X40 Series can be individually
enabled and disabled by writing to the Peripheral Clock Enable (PS_PCER) and Periph-
eral Clock Disable Registers (PS_PCDR). The status of the peripheral clocks can be
read in the Peripheral Clock Status Register (PS_PCSR).
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.
To avoid data corruption or erroneous behavior of the system, the system software only
disables the clock after all programmed peripheral operations have finished.
The peripheral clocks are automatically enabled after a reset.
The bits that control the peripheral clocks are the same as those that control the Inter-
rupt Sources in the AIC.
1354D–ATARM–08/02
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