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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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68HC705SB7 датащи(PDF) 39 Page - Freescale Semiconductor, Inc |
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68HC705SB7 датащи(HTML) 39 Page - Freescale Semiconductor, Inc |
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39 / 170 page  August 27, 1998 GENERAL RELEASE SPECIFICATION MC68HC05SB7 RESETS MOTOROLA REV 2.1 5-1 SECTION 5 RESETS This section describes the five reset sources and how they initialize the MCU. A reset immediately stops the operation of the instruction being executed, initializes certain control bits, and loads the program counter with a user defined reset vec- tor address. The following conditions produce a reset: • Initial power up of device (power on reset). • A logic zero applied to the RESET pin (external reset). • Timeout of the COP watchdog (COP reset). • Low voltage applied to the device (LVR reset). • Fetch of an opcode from an address not in the memory map (illegal address reset). Figure 5-1 shows a block diagram of the reset sources and their interaction. Figure 5-1. Reset Sources RESET RESET LATCH MCU INTERNAL REGISTER R COP WATCHDOG POWER-ON RESET ILLEGAL ADDRESS RESET INTERNAL D INTERNAL CLOCK S RST TO CPU AND LOW VOLTAGE RESET VDD 3-CYCLE CLOCKED ONE-SHOT SUBSYSTEMS ADDRESS BUS 100K Ω VDD |
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