EA-APP-002 Embedded Artists, EA-APP-002 Datasheet - Page 26

• Manufacturer Part Number: EA-APP-002
• Description: Development Boards & Kits - ARM LOW POWER APP KIT LPC11U37 (ORYX)
• Manufacturer: Embedded Artists

Specifications of EA-APP-002

• Rohs: yes
• Product: Demonstration Kits
• Tool Is For Evaluation Of: LPC11U37
• Core: ARM Cortex M0
• Interface Type: I2C, USB
• Operating Supply Voltage: 5 V

Copyright 2012 © Embedded Artists AB
Low-power Application Kit (Oryx) - User’s Guide
The sample applications created for the board typically use either sleep or power down mode to
conserve power consumption.
5.1.1
Note that the debugger (LPC-LINK) can only connect to the LPC11U37 in active and sleep mode.
When the LPC11U37 is in any of the three other low-power modes (deep sleep, power down, deep
power down) it is not possible for a debugger to connect. There are two problems with this:
Figure 13 – LPCXpresso IDE Error Message
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Deep power down – this mode has the lowest power consumption. All parts of the chip are
powered down expect five 32-bit registers. The program structure is different (than with the
other modes) if this mode is used because the processor wakes up again like after a reset.
The content of the 5 registers is the only information left from before entering this mode.
When flashing a new program, the processor can already be in a low-power mode making it
impossible to connect to the processor and download the new program. An error message
like illustrated in Figure 10 is typical in this case. The solution is to force the processor into
ISP/bootload mode before trying to download/flash a new program. Just follow the steps
below to accomplish this:
When starting a newly downloaded application, the debugger will lose connection with the
processor. An error message like illustrated in Figure 13 is typical in this case. The program
starts off in active mode but as soon as deep sleep, power down or deep power down is
entered an error message like below will be displayed. The problem is that it becomes
impossible to debug the processor after this point. It is not possible to set break point or stop
the processor. It is also not possible to read variable values to help debug the application.
Low-Power Modes and Debugging
o Press both Reset and ISP push-button
o Release the Reset push-button
o Release the ISP push-button
o Start flashing via the LPCXpresso IDE
o When developing an application it is recommended to only use sleep mode, even if
other low-power modes are planned to be used. When the application is debugged
the real low-power mode can be used, for example deep sleep or power down mode.
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