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ATmega128 データシート(PDF) 30 Page - ATMEL Corporation |
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ATmega128 データシート(HTML) 30 Page - ATMEL Corporation |
30 / 61 page Hardware Description 3-20 AVR STK500 User Guide 1925C–AVR–3/03 When connected to an external system, there is often an external pull-up resistor con- nected to the reset line. A typical reset connection is shown in Figure 3-27. Figure 3-27. External Reset Connection If the external pull-up resistor is too low (<4.7 k Ω), STK500 will not be able to pull the RESET line low. 3.8.4 Clock Settings, XTAL1 and OSCSEL STK500 includes several clock options for the target AVR. Setting the jumpers XTAL1 and OSCSEL controls the clock selections. OSCSEL determines what signal to route to the XTAL1 pin of the AVR. When the XTAL1 jumper is connected, the STK500 internal clock system is used as main clock to the target AVR. When XTAL1 jumper is not mounted, the internal clock system is disconnected. This allows external clock signals or crystals to be used as tar- get clock source for the AVR. Figure 3-28 illustrates the XTAL1 jumper option. Figure 3-28. XTAL1 Jumper Options When the XTAL1 jumper is not mounted, an external clock source or crystal can be con- nected to the PORTE header. This is shown in Figure 3-30. R (4.7 kohm) C (10 nF) RESET AREF RESET XTAL1 OSCSEL Jumper Mounted On-board XTAL1 Signal Connected (Default) AREF RESET XTAL1 OSCSEL Jumper not Mounted On-board XTAL1 Signal Disconnected |
同様の部品番号 - ATmega128 |
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同様の説明 - ATmega128 |
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