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数据搜索系统，热门电子元器件搜索 |
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AT89LP51 数据表(PDF) 30 Page - ATMEL Corporation |
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AT89LP51 数据表(HTML) 30 Page - ATMEL Corporation |
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30 / 113 page  30 3709C–MICRO–5/11 AT89LP51/52 - Preliminary An optional 5 M Ω on-chip resistor can be connected between XTAL1 and GND. This resistor can improve the startup characteristics of the oscillator especially at higher frequencies. The resistor can be enabled/disabled with the R1 User Fuse (See “User Configuration Fuses” on page 86.) Figure 6-2. Crystal Oscillator Connections Note: 1. C1, C2 = 5 pF ± 5pF for Crystals =5 pF ± 5pF for Ceramic Resonators 6.2 External Clock Source The external clock option disables the oscillator amplifier and allows XTAL1 to be driven directly by an external clock source as shown in Figure 6-3. XTAL2 may be left unconnected, used as general purpose I/O P4.7, or configured to output a divided version of the system clock. Figure 6-3. External Clock Drive Configuration 6.3 Internal RC Oscillator The AT89LP51/52 has an Internal Auxiliary oscillator tuned to 1.8432 MHz ±2.0%. When enabled as the clock source, XTAL1 and XTAL2 may be used as P4.6 and P4.7 respectively. ~10 pF ~10 pF C2 C1 R1 ~5 M Ω XTAL2 (P4.7) XTAL1 (P4.6) GND NC GPIO EXTERNAL OSCILLATOR SIGNAL |
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