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MC68HC705MC4MP データシート(PDF) 49 Page - Freescale Semiconductor, Inc |
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MC68HC705MC4MP データシート(HTML) 49 Page - Freescale Semiconductor, Inc |
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49 / 180 page ![]() General Release Specification Resets General Release Specification — MC68HC705MC4 Section 5. Resets 5.1 Contents 5.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49 5.3 External Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 5.4 Internal Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 5.4.1 Illegal Address Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 5.4.2 Power-On Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51 5.4.3 Computer Operating Properly Reset . . . . . . . . . . . . . . . . . .51 5.2 Introduction The MCU can be reset from four sources: one external input and three internal reset conditions. The RESET pin is an input with a Schmitt trigger as shown in Figure 5-1. The CPU and all peripheral modules will be reset by the RST signal which is the logical OR of internal reset functions and is clocked by the internal bus clock. The RESET pin will also be pulled low by internal reset for four bus cycles. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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