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ATtiny167-ESSZ датащи(PDF) 215 Page - ATMEL Corporation |
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ATtiny167-ESSZ датащи(HTML) 215 Page - ATMEL Corporation |
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215 / 282 page ![]() 215 7728D–AVR–07/09 ATtiny87/ATtiny167 19. DebugWIRE On-chip Debug System 19.1 Features • Complete Program Flow Control • Emulates All On-chip Functions, Both Digital and Analog, except RESET Pin • Real-time Operation • Symbolic Debugging Support (Both at C and Assembler Source Level, or for Other HLLs) • Unlimited Number of Program Break Points (Using Software Break Points) • Non-intrusive Operation • Electrical Characteristics Identical to Real Device • Automatic Configuration System • High-Speed Operation • Programming of Non-volatile Memories 19.2 Overview The debugWIRE On-chip debug system uses a One-wire, bi-directional interface to control the program flow, execute AVR instructions in the CPU and to program the different non-volatile memories. 19.3 Physical Interface When the debugWIRE Enable (DWEN) Fuse is programmed and Lock bits are unpro- grammed, the debugWIRE system within the target device is activated. The RESET port pin is configured as a wire-AND (open-drain) bi-directional I/O pin with pull-up enabled and becomes the communication gateway between target and emulator. Figure 19-1. The debugWIRE Setup Figure 19-1 shows the schematic of a target MCU, with debugWIRE enabled, and the emula- tor connector. The system clock is not affected by debugWIRE and will always be the clock source selected by the CKSEL Fuses. When designing a system where debugWIRE will be used, the following observations must be made for correct operation: Vcc +1.8 - +5.5V GND dW (RESET) dW |
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