M42800A Atmel Corporation, M42800A Datasheet - Page 34

• 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

11.11.3
34
AT91M42800A
External Wait
Figure 11-14. Data Float Output Time
Notes:
The NWAIT input can be used to add wait states at any time. NWAIT is active low and is
detected on the rising edge of the clock.
If NWAIT is low at the rising edge of the clock, the EBI adds a wait state and changes neither
the output signals nor its internal counters and state. When NWAIT is de-asserted, the EBI fin-
ishes the access sequence.
The NWAIT signal must meet setup and hold requirements on the rising edge of the clock.
Figure 11-15. External Wait
Notes:
1. Early Read Protocol
2. Standard Read Protocol
1. Early Read Protocol
2. Standard Read Protocol
NWAIT
ADDR
MCKI
D0-D15
NWE
NRD
NCS
ADDR
MCKI
NCS
NRD
(1)
(1)
(2)
(2)
t
DF
1779D–ATARM–14-Apr-06