R40008 Atmel Corporation, R40008 Datasheet - Page 120
R40008
Manufacturer Part Number
R40008
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(153 pages)
3.R40008.pdf
(19 pages)
4.R40008.pdf
(20 pages)
Specifications of R40008
Flash (kbytes)
0 Kbytes
Pin Count
100
Max. Operating Frequency
75 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)
256
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
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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Coprocessor Interface
4.7
4-16
Undefined instructions
Undefined instructions are treated by the ARM7TDMI processor as coprocessor
instructions. All coprocessors must be absent, CPA and CPB must be HIGH, when an
undefined instruction is presented. The ARM7TDMI processor takes the undefined
instruction trap.
For undefined instructions to be handled correctly, any coprocessors in a system must
give the absent response (CPA and CPB HIGH) to an undefined instruction. This allows
the core to take the undefined instruction exception.
The coprocessor must check bit 27 of the instruction to differentiate between the
following instruction types:
•
•
Coprocessor instructions are not supported in the Thumb instruction set but undefined
instructions are. All coprocessors must monitor the state of the TBIT output from
ARM7TDMI core. When the ARM7TDMI core is in Thumb state, coprocessors must
drive CPA and CPB HIGH, and the instructions seen on the data bus must be ignored.
In this way, coprocessors do not execute Thumb instructions in error, and all undefined
instructions are handled correctly.
undefined instructions have 0 in bit 27
coprocessor instructions have 1 in bit 27.
Copyright © 1994-2001. All rights reserved.
ARM DDI 0029G
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