M42800A Atmel Corporation, M42800A Datasheet - Page 263
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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B.13
B.13.1 Hardware breakpoints
ARM DDI 0029G
Programming breakpoints
Hardware breakpoints on page B-45
Software breakpoints on page B-46
To make a watchpoint unit cause hardware breakpoints on instruction fetches:
1.
2.
3.
4.
5.
6.
7.
8.
Breakpoints are classified as hardware breakpoints or software breakpoints:
Program its address value register with the address of the instruction to be
breakpointed.
For an ARM-state breakpoint, program bits [1:0] of the address mask register to
11. For a breakpoint in Thumb state, program bits [1:0] of the address mask
register to 01.
Program the data value register only when you require a data-dependent
breakpoint, that is only when you need to match the actual instruction code
fetched as well as the address. If the data value is not required, program the data
mask register to
Program the control value register with nOPC = 0.
Program the control mask register with nOPC = 0.
When you need to make the distinction between User and non-User mode
instruction fetches, program the nTRANS value and mask bits appropriately.
If required, program the EXTERN, RANGE, and CHAIN bits in the same way.
Program the mask bits for all unused control values to 1.
Copyright © 1994-2001. All rights reserved.
Typically monitor the address value and can be set in any code, even in
code that is in ROM or code that is self-modifying.
Monitor a particular bit pattern being fetched from any address. One
EmbeddedICE watchpoint can therefore be used to support any number
of software breakpoints. Software breakpoints can normally be set only
in RAM because a special bit pattern chosen to cause a software
breakpoint has to replace the instruction.
, all bits to 1. Otherwise program it to
Debug in Depth
B-45
.
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