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ATmega128 Scheda tecnica(PDF) 26 Page - ATMEL Corporation |
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ATmega128 Scheda tecnica(HTML) 26 Page - ATMEL Corporation |
26 / 61 page Hardware Description 3-16 AVR STK500 User Guide 1925C–AVR–3/03 3.8.1 Target V CC Settings, VTARGET VTARGET controls the supply voltage to the target AVR microcontroller sockets. It can either be controlled from AVR Studio or supplied from an external source. If the VTAR- GET jumper is mounted, the on-board supply voltage is connected. The on-board supply voltage can be adjusted to 0 - 6V from AVR Studio. Always verify the respective datasheet for the AVR device operating voltage before adjusting VTARGET voltage. Using the on-board supply voltage, approximately 0.5A can be delivered to the target section. See “Appendix A” in Section 10. If the VTARGET jumper is disconnected, target V CC must be supplied from an external source at one of the VTG pins on the PORT headers. Figure 3-21 explains VTARGET jumper options. When using an external source for VTARGET, the user must control that VTARGET is at a higher voltage level than AREF (analog reference voltage). Always connect com- mon ground (GND) when using an external VTARGET voltage. Figure 3-21. VTARGET Jumper Options The STK500 master microcontroller controls the target voltage using the internal PWM. Figure 3-22 shows the internal connection of the VTARGET signal. Figure 3-22. VTARGET Connection Note: The green LED will light when there is a voltage available on the VTG NET. It’s impossible to use the debug or programming area of STK500 without VTG. VTARGET AREF VTARGET AREF Jumper Mounted Jumper not Mounted On-board VTARGET supply connected (default) On-board VTARGET supply disconnected Master MCU VTARGET PWM VTG NET Green LED Jumper Voltage Regulator 10 - 15V VIN 0 - 6V Wr Rd ADC |
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Descrizione simile - ATmega128 |
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