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AT90PWM2 Datasheet(PDF) 271 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 271 Page - ATMEL Corporation |
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271 / 365 page  271 AT90PWM2/3 4317B–AVR–02/05 debugWIRE On-chip Debug System 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 Overview The debugWIRE On-chip debug system uses a One-wire, bi-directional interface to con- trol the program flow, execute AVR instructions in the CPU and to program the different non-volatile memories. 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 132. The debugWIRE Setup Figure 132 shows the schematic of a target MCU, with debugWIRE enabled, and the emulator 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: • Pull-up resistors on the dW/(RESET) line must not be smaller than 10k Ω. The pull- up resistor is not required for debugWIRE functionality. • Connecting the RESET pin directly to V CC will not work. dW GND dW(RESET) VCC 1.8 - 5.5V |
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