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HC08KL8GRS/D bảng dữ liệu(PDF) 84 Page - NXP Semiconductors |
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HC08KL8GRS/D bảng dữ liệu(HTML) 84 Page - NXP Semiconductors |
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84 / 256 page ![]() System Integration Module (SIM) General Release Specification MC68HC08KL8 — Rev. 2.0 System Integration Module (SIM) 8.4.2 Active Resets from Internal Sources All internal reset sources actively pull the RST pin low for 32 CGMXCLK cycles to allow resetting of external peripherals. The internal reset signal IRST continues to be asserted for an additional 32 cycles. (See Figure 8-5.) An internal reset can be caused by an illegal address, illegal opcode, COP timeout, the USB module, or POR. (See Figure 8-6.) Note that for POR resets, the SIM cycles through 4096 CGMXCLK cycles during which the SIM forces the RST pin low. The internal reset signal then follows the sequence from the falling edge of RST shown in Figure 8-5. Figure 8-5. Internal Reset Timing The COP reset is asynchronous to the bus clock. Figure 8-6. Sources of Internal Reset The active reset feature allows the part to issue a reset to peripherals and other chips within a system built around the MCU. IRST RST RST PULLED LOW BY MCU IAB 32 CYCLES 32 CYCLES VECTOR HIGH CGMXCLK ILLEGAL ADDRESS RST ILLEGAL OPCODE RST COPRST POR INTERNAL RESET USB Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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