M40800 Atmel Corporation, M40800 Datasheet - Page 121
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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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4.8
ARM DDI 0029G
Privileged instructions
The output signal nTRANS allows the implementation of coprocessors, or coprocessor
instructions, that can only be accessed from privileged modes. The signal meanings are
given in Table 4-4.
If used, the nTRANS signal must be sampled at the same time as the coprocessor
instruction is fetched and is used in the coprocessor pipeline Decode stage.
If a User mode process, with nTRANS LOW, tries to access a coprocessor instruction
that can only be executed in a privileged mode, the coprocessor responds with CPA and
CPB HIGH. This causes the ARM7TDMI processor to take the undefined instruction
trap.
Note
Copyright © 1994-2001. All rights reserved.
Table 4-4 Mode identifier signal meanings (nTRANS)
nTRANS
0
1
Meaning
User mode instruction
Privileged mode instruction
Coprocessor Interface
4-17
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