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Re: Dual Power supply
How would that help?The Vusb will still be available across the 7805's output pin right? Besides, I cannot afford a 0.3 volt drop across the diode (I need a full 5 V supply). Anyway, I'm now using a SDPT across the output to select the source :)
RS232 buffer
I wanted to sniff communication between two RS232 devices. Thishttps://embeddedfreak.wordpress.com/2008/08/17/rs232-serial-sniffermonitoring-circuit/ link presents a simple solution but I want to make sure that my 'sniffer' does not load the communication link.
To that effect, I...
Re: Dual Power supply
Update: When I apply a 12V DC between the output and ground pins of the 7805, it draws about 50mA! I guess that means i need to isolate the outputs....
I want to power my microcontroller board using a 7805 (which receives input power via a DC adapter) and a USB port. Assuming only one of these power sources is active at a time, can i just tie the output of the usb and the 7805 together without using a jumper to select the appropriate power? If...
Re: PCB fabrication-India
Does anybody know where I can get PCBs fabricated in INDIA (Delhi preferably) if I give them the schematics? I'm a hobbyist and only looking for a couple of boards. All components are through hole.
Hi,
Thanks for the reply. I still have some queries: If the hex file contains only CODE, where is the info about the DATA maintained? All i give to my programmer is the hex file dump.
What exactly is inside a hex file? Is it just the machine code of the assembler mnemonics? or does it...
My controller has 32KB flash and a 2KB Ram.
When built on the IAR embedded workbench, my program gave the following outputs:
2 254 bytes of CODE memory (+ 3 absolute )
0 bytes of DATA memory (+ 22 absolute )
211 bytes of IDATA memory
When i see the hex file size, its 7KB.
1.Why...
Hi,
Is there any 8bit MCU out there that can be programmed/re flashed just using a PC's comport? All of them seem to require an external ISP. If you know any mcu family that has a serial port based program that sits on the MCU and enables in application programming via the com port, LET ME...
My MCU is a Samsung S3C8 series 8bit CMOS controller,and the board operates at 3 volts(I get this from a variable DC power supply).Consequently, the gpio pin cannot produce more than 3V.
The MCU has open drain outputs on some ports! I guess that means I can just use a pullup resistor to get...
My MCU 's gpio pin can output 3 volts. I need to output 4.2 volts for a certain signal. The pin can toggle at a max of 10Khz.
I was wondering if i could use the 2N3904 switching transistor for this purpose and drive it from the gpio pin. I don't want to use a cmos-ttl converter chip because...
I need to generate am output that is synchronized with the clock. But the output is high only during certain counts of the clock say 1,2, 45 and 100.At all other times, the output is zero. This happens in a repeated way(cycle).
What is the design methodology that i need to adopt? What i am...
parallel to usb jtag -xilinx
Has anybody used the usb to parallel port converters (around $10, Make: Bafo, Belkin etc) for JTAG programming? When i searched on the net, i found that these devices install a virtual usb printer driver (in windows) and provide only printer functionality, i,e they...
arm asm hello world
I want to simulate the below ARM assembly program on uvision3:
AREA HelloW, CODE, READONLY
SWI_WriteC EQU &0
SWI_Exit EQU &11
ENTRY
START ADR r1,TEXT
LOOP LDRB r0,[r1],#1
CMP r0,#0
SWINE SWI_WriteC
BNE LOOP
SWI SWI_Exit
TEXT =...
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