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SPMCK16Z4MPV16 bảng dữ liệu(PDF) 130 Page - Freescale Semiconductor, Inc |
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SPMCK16Z4MPV16 bảng dữ liệu(HTML) 130 Page - Freescale Semiconductor, Inc |
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130 / 500 page ![]() SYSTEM INTEGRATION MODULE M68HC16 Z SERIES 5-24 USER’S MANUAL 5.4 System Protection The system protection block preserves reset status, monitors internal activity, and pro- vides periodic interrupt generation. Figure 5-8 is a block diagram of the submodule. Figure 5-8 System Protection 5.4.1 Reset Status The reset status register (RSR) latches internal MCU status during reset. Refer to 5.7.10 Reset Status Register for more information. 5.4.2 Bus Monitor The internal bus monitor checks data size acknowledge (DSACK) or autovector (AVEC) signal response times during normal bus cycles. The monitor asserts the in- ternal bus error (BERR) signal when the response time is excessively long. DSACK and AVEC response times are measured in clock cycles. Maximum allowable response time can be selected by setting the bus monitor timing (BMT[1:0]) field in the system protection control register (SYPCR). Table 5-8 shows the periods allowed. SYS PROTECT BLOCK MODULE CONFIGURATION AND TEST RESET STATUS HALT MONITOR BUS MONITOR SPURIOUS INTERRUPT MONITOR SOFTWARE WATCHDOG TIMER PERIODIC INTERRUPT TIMER 29 PRESCALER CLOCK IRQ[7:1] BERR RESET REQUEST RESET REQUEST Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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