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schematic checking
Should AVCC be connected to VCC? I believe that there should be a positive voltage source on AVCC.
Friday, 15 July 2005 - 15:39
weired echo on UART test on atmega16
If the system is running on an external oscillator of 7.3728MHz, then this is the number that should be used for the system clock when calculating the baud rate. Try the baud...
Friday, 15 July 2005 - 15:29
weired echo on UART test on atmega16
I suspect that the problem is in the baud rate calculation. The current formula: 16MHz / (614400 -1) might need to be changed to: ( (16MHz/ 38400) / 16) - 1 This would explain...
Friday, 15 July 2005 - 15:23
Real Time Clock
An alternative to the expensive DS1307 ICs is to use a Tiny11 AVR with a crystal as a real-time clock chip with a pseudo-I2C interface. There seems to be some internal...
Thursday, 14 July 2005 - 16:15
Disabling a Microcontroller
Consider putting the AVR into Power-Down Sleep mode and waking it up when necessary with a pulse to the INT0 line.
Wednesday, 13 July 2005 - 22:03
Asychronous Serial Multiplexer
It may be possible to handle these four devices in software. Set the timer to a period that is a maximum of 1/2 of the period of the fastest serial input. Check for start bits...
Wednesday, 13 July 2005 - 21:58
help wanted in assembly...
Well, this code seems to be from some specialized machine. For one thing, it uses a software serial port instead of using the Universal Async Receive/Transmit (UART) part of the...
Wednesday, 13 July 2005 - 01:57
Pins for hobbyists survey
I'd like to have an AVR with 16 pins (ground, VCC, Vref, one 8-bit I/O port with all pins on the same side of the chip, UART, SPI, ISP, JTAG, and a 10-bit ADC). It would sell...
Sunday, 10 July 2005 - 17:29
Avr atmega 8535 relationship to 8051
If you can possibly change to another 40 pin (in DIP) AVR, then the Mega8515 has the same pin-out as the Intel 8051. The Mega161 and Mega162 do also. However, the 8515 and 161...
Wednesday, 29 June 2005 - 00:19
Why is INT1 defined as 7 and not as 0x80
This confusing situation results from the AVR having only 16 bits for an op-code. The SBR (Set Bits in Register) instruction uses a bit mask (0-255) and can change all eight bits...
Monday, 27 June 2005 - 21:06
Comparator output to I/O?
analog in----(5K ohms) ----PB0 Vcc (+5V)-----(10K ohms)----analog in----(20K ohms)----PB1 three resistors connected to the Analog Compare pin This is a way to implement hysteresis...
Monday, 27 June 2005 - 20:47
Schematic and pcb layout
Well I will remove all doubts about my being a fool. Generally yes you can get a PCB layout done from a schematic by a company. Generally it is expensive. Maybe $50/hr and up...
Monday, 20 June 2005 - 21:50