By T P Martin
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Additional resources for The insider's guide to the Philips ARM7-based microcontrollers : an engineer's introduction to the LPC2100 series
You should also note that the In Application functions return in ARM mode not THUMB. The IAP functions require the top 32 bytes of on-chip RAM, so you must either locate the stacks to start below this region so it 53 Introduction to the LPC2000 3 – System Peripherals is unused, or, if you need all the RAM, place the IRQ stack at the top of memory and disable interrupts before you enter the IAP routines. Using a pointer you can now copy the top 32 bytes of on-chip SRAM into a temporary array and then restore them once you return from the IAP functions.
If the ARM7 CPU is reset, all of the peripherals including the JTAG are reset. When this happens the ULINK debugger loses control of the chip and has to re-establish control once the LPC2000 device comes out of reset. This will take a finite number of clock cycles. While this is happening, any code which is on the chip will be run as normal. Once the ULINK gets back control of the chip, it performs a soft reset by forcing the PC back to address zero. However, the onchip peripherals are no longer in the reset condition ie peripherals will be initialised, interrupt enabled etc.
To help with this analysis and also to gauge the effectiveness of the MAM, there are a group of statistical registers which can be used to measure the MAM’s performance. The MAM has some statistics registers which show the number of accesses to the FLASH and the number of accesses to the MAM so the effectiveness of the MAM can be calculated 47 Introduction to the LPC2000 3 – System Peripherals The Statistics registers are based around two counters which record the accesses made to the FLASH and the accesses made to the MAM buffers.
The insider's guide to the Philips ARM7-based microcontrollers : an engineer's introduction to the LPC2100 series by T P Martin