M55800A Atmel Corporation, M55800A Datasheet - Page 248

• 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

Figure 27-2.
Note:
Figure 27-3.
Note:
248
MCKI
NWAIT
NCS
MCKI
NWAIT
NRD
1. These numbers refer to the standard access cycles.
1. These numbers refer to the standard access cycles.
AT91M5880A
Number of Standard Wait States is Two
Number of Standard Wait States is One
1 (1)
1
(1)
Standard Access Length with Two Wait States
If the first two conditions are not met during a 32-bit read access, the first 16-bit data is read at
the end of the standard 16-bit read access. In the following example, the number of standard
waits is one. NWAIT assertions do affect both NRD pulse lengths, but first data sampling is not
delayed. The second data sampling is correct.
32-bit Access = Two 16-bit Accesses
Each Access Length = One Wait State + Assertion for One More Cycle
EBI
5
2 (1)
First Data Sampling
EBI
(Erroneous)
5
2
(1)
2 (1)
1 (1)
2 (1)
2 (1)
3
1745F–ATARM–06-Sep-07
(1)
Second Data
Sampling
(Correct)