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Channel Bandwidth and Bit Rate
If we like transmitting digital data [0,1] thru a voice channel (as 300 to 3300 Hz), could the bit rate be made close to the bandwidth upper limit?   I am working on it by...
Thursday, 23 November 2017 - 00:36
Warning of redefining a register
I have ATmega8 and I write its codes in assembly only using AS6.2 SP1.   I agree that, in case a register is redefined, the warning is useful in general; it...
Thursday, 28 September 2017 - 14:23
TWI: General call 0000000 for read
I have two ATmega8 MCUs. The first one, the TWI master, is on an inverter board. The second one, the TWI slave, is on a meter board (measuring the battery voltage and...
Wednesday, 13 September 2017 - 15:28
OC1A, OC1B and synchronization
I have ATmega8. I need generating two synchronized PWM signals at pins OC1A and OC1B; having the same frequency and duty cycle. Actually, the output signal at one pin is the...
Monday, 28 August 2017 - 21:40
ATmega8A instructions .lds and .sts versus lds and sts
On a list file, *.lss, generated by AS6, one can notice the following lines:   "ATmega8A" instruction use summary: .lds  :   0 .sts  :   0 adc...
Tuesday, 15 August 2017 - 13:29
Bits of I/O registers as user’s flags
I have ATmega8 I write my MCU firmware in assembly. I usually use the bits of r25 and r24 as flags.   In my last program, UART protocol wasn’t used and I kept it inactive. I...
Wednesday, 10 August 2016 - 13:10
Side effect of RETI?
I mean what could be the possible undesired/unexpected side effect of calling an interrupt service routine by RCALL?   Thank you.
Sunday, 26 June 2016 - 15:26
Resetting just one interrupt flag in TIFR
Do you think there is a simple way to reset just one timer interrupt flag (as TOV2 for example) in TIFR?   I have ATmega8A and I faced this situation while an external...
Saturday, 11 June 2016 - 07:20
Measuring the average current of an acid battery
In a DC to AC inverter set, the in/out current of a battery could be periodic (mainly during its charging) or real DC (if discharged by a DC load, as LEDs connected directly...
Sunday, 29 May 2016 - 15:35
Mains Voltage Versatile Detector
I design a mains voltage (220V, 50Hz) detector to provide, via an optoisolator as 4N35, the real time status of the mains voltage to the MCU interrupt pin (as of ATmega8A that I...
Tuesday, 10 May 2016 - 05:10
Old test in communications, DSB-SC
About 37 years ago, I built, as a test, a low power AM generator. Its output signal was: [1] double sideband suppressed carrier (DSB-SC) and, [2] the frequency of its ‘suppressed...
Friday, 18 March 2016 - 13:03
Raw USB port
To me, USB is rather a black box because I can’t access all technical resources and services that are available to most engineers in the world. So it is impossible for me to...
Wednesday, 13 January 2016 - 06:55