M55800A Atmel Corporation, M55800A Datasheet - Page 17

• Manufacturer Part Number: M55800A
• Manufacturer: Atmel Corporation

Specifications of M55800A

• Flash (kbytes): 0 Kbytes
• Pin Count: 176
• Max. Operating Frequency: 33 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 58
• Ext Interrupts: 58
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 3
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 72
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• 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

7.7
1745F–ATARM–06-Sep-07
External Bus Interface
The External Bus Interface handles the accesses between addresses 0x0040 0000 and 0xFFC0
0000. It generates the signals that control access to the external devices, and can configure up
to eight 16-Mbyte banks. In all cases it supports byte, half-word and word aligned accesses.
For each of these banks, the user can program:
The External Bus Interface features also the Early Read Protocol, configurable for all the
devices, that significantly reduces access time requirements on an external device.
• Number of wait states
• Number of data float times (wait time after the access is finished to prevent any bus
• Data bus width (8-bit or 16-bit)
• With a 16-bit wide data bus, the user can program the EBI to control one 16-bit device (Byte
contention in case the device is too long in releasing the bus)
Access Select Mode) or two 8-bit devices in parallel that emulate a 16-bit memory (Byte-write
Access mode).
AT91M5880A
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