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AT89LP428 数据表(PDF) 24 Page - ATMEL Corporation |
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AT89LP428 数据表(HTML) 24 Page - ATMEL Corporation |
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24 / 149 page  24 3654A–MICRO–8/09 AT89LP428/828 Figure 7-1. Power-on Reset Sequence (BOD Disabled) Note: tPOR is approximately 92 µs ± 5%. If the Brown-out Detector (BOD) is also enabled, the start-up timer does not begin counting until after V CC reaches the BOD threshold voltage VBOD as shown in Figure 7-2. However, if this event occurs prior to the end of the initialization sequence, the timer must first wait for that sequence to complete before counting. The start-up timer delay is user-configurable with the Start-up Time User Fuses and depends on the clock source (Table 7-1). The Start-up Time fuses also control the length of the start-up time after a Brown-out Reset or when waking up from Power-down during internally timed mode. The start-up delay should be selected to provide enough settling time for V CC and the selected clock source. The device operating environment (supply voltage, frequency, temperature, etc.) must meet the minimum system requirements before the device exits reset and starts normal opera- tion. The RST pin may be held low externally until these conditions are met. Figure 7-2. Power-on Reset Sequence (BOD Enabled) VCC RST Time-out t POR + tSUT t RHD V POR Internal Reset RST Internal Reset V IH (RST Tied to V CC) (RST Controlled Externally) V POR VCC RST Time-out t POR t RHD V POR Internal Reset RST Internal Reset V IH t SUT V BOD (RST Tied to V CC) (RST Controlled Externally) |
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