M42800A Atmel Corporation, M42800A Datasheet - Page 34
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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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
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