M40800 Atmel Corporation, M40800 Datasheet - Page 92
M40800
Manufacturer Part Number
M40800
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(21 pages)
3.M40800.pdf
(18 pages)
4.M40800.pdf
(153 pages)
Specifications of M40800
Flash (kbytes)
0 Kbytes
Pin Count
100
Max. Operating Frequency
40 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
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
1.8/3.3
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
32khz Rtc
No
Calibrated Rc Oscillator
No
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Memory Interface
3-22
ARM7TDMI core test chip example system
Connecting the ARM7TDMI processor data bus, D[31:0] to an external shared bus
requires additional logic that varies between applications in the case of a test chip.
In this application, care must be taken to prevent bus clash on D[31:0] when the data
bus drive changes direction. The timing of nENIN, and the pad control signals must be
arranged so that when the core starts to drive out, the pad drive onto D[31:0] is disabled
before the core starts to drive. Similarly, when the bus switches back to input, the core
must stop driving before the pad is enabled.
The circuit implemented in the ARM7TDMI processor test chip is shown in Figure 3-17
on page 3-23.
Copyright © 1994-2001. All rights reserved.
ARM DDI 0029G
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