M42800A Atmel Corporation, M42800A Datasheet - Page 10

• 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

interrupt request to the ARM7TDMI. It integrates an 8-level priority controller, and, using the
Auto-vectoring feature, reduces the interrupt latency time.
The Parallel Input/Output Controllers (PIOA, PIOB) controls up to 54 I/O lines. It enables the
user to select specific pins for on-chip peripheral input/output functions, and general-purpose
input/output signal pins. The PIO controllers can be programmed to detect an interrupt on a
signal change from each line.
There are three embedded system timers. The Real-time Timer (RTT) counts elapsed sec-
onds and can generate periodic or programmed interrupts. The Period Interval Timer (PIT)
can be used as a user-programmable time-base, and can generate periodic ticks. The Watch-
dog (WD) can be used to prevent system lock-up if the software becomes trapped in a
deadlock.
The Special Function (SF) module integrates the Chip ID and the Reset Status registers.
5.2.2
User Peripherals
Two USARTs, independently configurable, enable communication at a high baud rate in syn-
chronous or asynchronous mode. The format includes start, stop and parity bits and up to 9
data bits. Each USART also features a Time-out and a Time-guard register, facilitating the use
of the two dedicated Peripheral Data Controller (PDC) channels.
The two 3-channel, 16-bit Timer/Counters (TC) are highly-programmable and support capture
or waveform modes. Each TC channel can be programmed to measure or generate different
kinds of waves, and can detect and control two input/output signals. Each TC also has three
external clock signals.
Two independently configurable SPIs provide communication with external devices in master
or slave mode. Each has four external chip selects which can be connected to up to 15
devices. The data length is programmable, from 8- to 16-bit.
AT91M42800A
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1779D–ATARM–14-Apr-06