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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATMEGA16 датащи(PDF) 217 Page - ATMEL Corporation |
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ATMEGA16 датащи(HTML) 217 Page - ATMEL Corporation |
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217 / 315 page  217 ATmega16(L) 2466E–AVR–10/02 The IEEE std. 1149.1 also specifies an optional TAP signal; TRST – Test ReSeT – which is not provided. When the JTAGEN Fuse is unprogrammed, these four TAP pins are normal port pins, and the TAP controller is in reset. When programmed, the input TAP signals are inter- nally pulled high and the JTAG is enabled for Boundary-scan and programming. The device is shipped with this fuse programmed. For the On-chip Debug system, in addition to the JTAG interface pins, the RESET pin is monitored by the debugger to be able to detect external reset sources. The debuggerbta can also pull the RESET pin low to reset the whole system, assuming only open collec- tors on the reset line are used in the application. Figure 112. Block Diagram TAP CONTROLLER TDI TDO TCK TMS FLASH MEMORY AVR CPU DIGITAL PERIPHERAL UNITS JTAG / AVR CORE COMMUNICATION INTERFACE BREAKPOINT UNIT FLOW CONTROL UNIT OCD STATUS AND CONTROL INTERNAL SCAN CHAIN M U X INSTRUCTION REGISTER ID REGISTER BYPASS REGISTER JTAG PROGRAMMING INTERFACE PC Instruction Address Data BREAKPOINT SCAN CHAIN ADDRESS DECODER I/O PORT 0 I/O PORT n BOUNDARY SCAN CHAIN DEVICE BOUNDARY |
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