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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LPC81XM датащи(PDF) 28 Page - NXP Semiconductors |
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LPC81XM датащи(HTML) 28 Page - NXP Semiconductors |
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28 / 67 page  LPC81xM All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Objective data sheet Rev. 1.0 — 7 November 2012 28 of 67 NXP Semiconductors LPC81xM 32-bit ARM Cortex-M0+ microcontroller 7.22 Emulation and debugging Debug functions are integrated into the ARM Cortex-M0+. Serial wire debug functions are supported in addition to a standard JTAG boundary scan. The ARM Cortex-M0+ is configured to support up to four breakpoints and two watch points. The Micro Trace Buffer is implemented on the LPC81xM. The RESET pin selects between the JTAG boundary scan (RESET = LOW) and the ARM SWD debug (RESET = HIGH). The ARM SWD debug port is disabled while the LPC81xM is in reset. The JTAG boundary scan pins are selected by hardware when the part is in boundary scan mode on pins PIO0_0 to PIO0_3 (see Table 3). To perform boundary scan testing, follow these steps: 1. Erase any user code residing in flash. 2. Power up the part with the RESET pin pulled HIGH externally. 3. Wait for at least 250 s. 4. Pull the RESET pin LOW externally. 5. Perform boundary scan operations. 6. Once the boundary scan operations are completed, assert the TRST pin to enable the SWD debug mode, and release the RESET pin (pull HIGH). Remark: The JTAG interface cannot be used for debug purposes. |
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