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MPC5200 датащи(PDF) 17 Page - Freescale Semiconductor, Inc |
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MPC5200 датащи(HTML) 17 Page - Freescale Semiconductor, Inc |
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17 / 80 page ![]() Electrical and Thermal Characteristics MPC5200 Data Sheet, Rev. 4 Freescale Semiconductor 17 For additional information, see the MPC5200 User Manual [1]. NOTE Make sure that the PORRESET does not carry any glitches. The MPC5200 has no filter to prevent them from getting into the chip. NOTE HRESET and SRESET must have a monotonous rise time. 3.3.3.1 Reset Configuration Word During reset (HRESET and PORRESET) the Reset Configuration Word is cached in the related Reset Configuration Word Register with each rising edge of the SYS_XTAL signal. If both resets (HRESET and PORRESET) are inactive (high), the contents of this register get locked after two further SYS_XTAL cycles (see Figure 3). Figure 3. Reset Configuration Word Locking Table 15. Reset Rise / Fall Timing Description Min Max Unit SpecID PORRESET fall time — 1 ms A3.4 PORRESET rise time — 1 ms A3.5 HRESET fall time — 1 ms A3.6 HRESET rise time — 1 ms A3.7 SRESET fall time — 1 ms A3.8 SRESET rise time — 1 ms A3.9 sample sample sample sample sample sample sample sample sample sample sample sample LOCK RST_CFG_WRD HRESET PORRESET SYS_XTAL 4096 clocks 2 clocks |
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