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PMOS in parallel with NMOS Let's say I have a microcontroller pin that will have one of three states: 5 V, 0 V or high impedence. Let's say I have a PMOS and an NMOS, and I connect their gates together. I connect the microcontoller pin to the gates. Now, when my pin is high, the NMOS will turn on. When the pin is low, the PMOS will tu... 7 May 2008 14:53
ANNC: FPGA Design Software Webcast Lattice is holding a webcast today, Wednesday, May 7th, on our latest version of our FPGA software design tools "ispLEVER 7.1 FPGA Design Tool Technical Rollout." The presenter will be Troy Scott, from our software marketing group. If you're interested, the event takes place live at 11am Pacific, 18:00 GMT. In a... 7 May 2008 14:53
Clock and Asynchronous Reset with just one pin I have a counter chip whose output is decoded. (The 4017 Johnson decade counter). As you clock it, the output pins go high in sequence. It has an asynchronous reset. What I want to do is the following: Loop: * Assert the reset to make sure it starts counting at zero * De-assert the reset * Cloc... 7 May 2008 14:53
Loss of synchronisation: Are the chips reliable? A lot of you are familiar with the method of using a shift register to multiplex a matrix of LED's. My college project this year was to make a Connect4 game consisting of a 7x6 matrix of LED's. I had two choices for implementing the display: 1) Use two pins from the microcontroller 2) Use one pin from... 7 May 2008 13:14
Just assume that it's not in a defined state? On May 4, 12:04 pm, Tomás Ó hÉilidhe <t...(a)lavabit.com> wrote: You know chips like the 164 shift register, well I've been reading over the data sheet and it doesn't mention anything about the "boot up" state of the device. That is to say, if I have the master-reset tied high (it's active low), then what hap... 7 May 2008 12:24
Loss of synchronisation: Are the chips reliable? Tom�s � h�ilidhe wrote: The PC I'm typing on right now is perfect. Most certainly not. It's working exactly as intended. When I press "e", an "e" appears on the screen. Even if I press "e" one million times I'll still only ever get an "e". So you believe. But you're wrong. The odds that a give... 7 May 2008 11:35
Integer Square Root Algorithm for Processor with MUL, DIV Paul E. Bennett wrote: ... <quote> A classical Forth puzzle is: What does the following do? : ???? -1 TUCK DO 2 + DUP +LOOP 2/ ; It is a standard method of calculating square root by summing the odd integers. It works for all unsigned integers from 0 to FFFFFFFF (or FFFF). </quot... 7 May 2008 09:57
New low cost ARM7 boards are released Dear Sir/Madam, I am interested in ARM based boards, i have plans buying a kit, please guide me the suitable kit. also it must support LINUX OS. Dear All, We have released eight new low cost ARM7 development boards: SAM7-P64 - $59.95 development board with AT91SAM7S64 http://www.olimex.com/dev/... 7 May 2008 09:08
Had an interview On 2008-05-02, Robert Adsett <sub2(a)aeolusdevelopment.com> wrote: Changing a 2 to a 1 and a 1 to a two obviously ;) I have noted though that besides trying for the most obscure code to prove their worthiness to program no-one has actually verfied the inputs are in range. <rant> And? I don't know ab... 7 May 2008 07:31
TFT driver Hi, do you know any low cost lcd tft driver? I'm thinking also in a integrated solution (MCU with integrated lcd driver). What do you think? I'm searching a low cost and low power solution...Any suggestion? Thanks ... 7 May 2008 04:53
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AVR Assembler (Mega8) - Test if a value has changed more thana given amount Mike Warren wrote: Can someone please offer a suggestion for a way to check if a value has changed up or down by at least some threshold. It doesn't matter how long it takes but code size and register use are important. I'm not sure how to handle values lower than ChangeThreshold or higher then 255 -... 7 May 2008 00:56
AVR Assembler (Mega8) - Test if a value has changed more than a given amount Can someone please offer a suggestion for a way to check if a value has changed up or down by at least some threshold. It doesn't matter how long it takes but code size and register use are important. I'm not sure how to handle values lower than ChangeThreshold or higher then 255 - ChangeThreshold. ..equ Chang... 7 May 2008 00:08
Simple Clockable Decoder Chip Tom�s � h�ilidhe wrote: Only one pin is needed from the microcontroller. With the shift register setup, two pins are needed (one for clock, one for data input). You can make a vanilla OneWire Shift-Register interface, by using a RC on the Data pin, and pulse-width varying the clock. Assuming a P... 6 May 2008 23:21
Choosing Bi-port Ethernet Chip I've searched the web and I've only found two chips that can interface with 2 ethernet ports. They are: AX88742 AX88783 On the manufacturer's website, they describe the 42 variant as: 32-bit PCI 2-Port 10/100M Fast Ethernet Controller And the 83 variant as: Non-PCI 8/16/32-bit 2-Port ... 6 May 2008 23:21
CCD Chips Apologies if this is the wrong place for this but here goes, I have just finished reading/working my way through "programming and customizing the AVR microcontroller" and one of the "ideas for projects" listed in the back is a CCD camera controller. This very much appeals to me, so I have done a quick google f... 6 May 2008 23:21
ASCII Text to I8HEX Format Converter Grant Edwards ha scritto: I give up. What about it? ehm, ASCII text file don't contain any address, HEX file records needs addresses; may be that the tool objcopy will make the good job starting with default address 0x00 ; else you should --set-start <addr> Set the start address to <addr> to ... 6 May 2008 22:24 |