| ??? 08/16/08 12:17 Read: times |
#157511 - not a power consumption issue Responding to: ???'s previous message |
in fact it's a part of an AVR high voltage programmer. Atmel says to enter programming mode the following algorithm must be done (from ATmega 16 datasheet):
1. Set Prog_enable pins listed in Table 108 on page 263 to “0000”. 2. Apply 4.5 - 5.5V between Vcc and GND simultanously as 11.5 - 12.5V is applied to RESET. those "Prog_enable pins" are four input pins. they should be zero before powering up the MCU. All pins of the target chip (that I called it slave before) that are involved in programming are input but one. this one also tied to one onput pin of the master MCU. therefore I think there is no considerable sink/source current through I/O pins. but I don't know how much current is needed during programming. Koosha |
| Topic | Author | Date |
| How to turn on/off another MCU | 01/01/70 00:00 | |
| Low-power mode? | 01/01/70 00:00 | |
| not a power consumption issue | 01/01/70 00:00 | |
| correction | 01/01/70 00:00 | |
| Logic MOSFET | 01/01/70 00:00 | |
| P-Channel Enhancement Mode Better | 01/01/70 00:00 | |
| that's why they make logic MOSFET's | 01/01/70 00:00 | |
| Makes No Difference | 01/01/70 00:00 | |
| Perhaps you should try a logic-MOSFET | 01/01/70 00:00 | |
| It Still Makes No Difference | 01/01/70 00:00 | |
| Maybe it's the load current | 01/01/70 00:00 | |
| Richard........................... | 01/01/70 00:00 | |
| I wouldn't say that ... | 01/01/70 00:00 | |
| possibly simpler idea | 01/01/70 00:00 | |
Thank you all, | 01/01/70 00:00 |