Read: 387 times
|#187491 - Write down your project requirements|
Responding to: ???'s previous message
Specify the number of external port lines that you need.
Sometimes pins can be shared.
Calculate the RAM / EEPROM that may be needed.
A single chip solution can often avoid any external memory bus.
Your physical chip size then depends on your GPIO requirements.
You seldom need super fast access to all RAM or EEPROM, so it is also worth considering external SPI or I2C chips if you can't find quite enough memory in a single microcontroller.
Your options are very wide. Getting your design requirements down on paper will speed you through.
|More Ports or Non-Volatile RAM||Kurt Adam||05/23/12 17:47|
|Numbers always help||Jim Granville||05/23/12 22:17|
|Trying to read your mind||Michael Karas||05/23/12 22:48|
|Write down your project requirements||David Prentice||05/24/12 04:54|
|Details||Kurt Adam||05/24/12 05:48|
|Most projects do not need external memory||David Prentice||05/24/12 06:20|
|SILabs have 8-porters||Erik Malund||05/24/12 07:30|
|Don't overlook the additional memory ...||Richard Erlacher||05/24/12 09:09|
|Further Details and Thankyou||Kurt Adam||05/24/12 08:44|
|AT89S8253 ?||Jim Granville||05/24/12 16:04|
|This worked. Thanks||Kurt Adam||05/30/12 17:54|
|Hold your horses||Hans Van Pelt||05/31/12 03:04|
|F-RAM||Per Westermark||05/31/12 05:31|
|Yes! I like 'em, and there's no write delay||Richard Erlacher||05/31/12 06:38|
|3 things||Erik Malund||05/31/12 07:33|
|some or all?||Erik Malund||05/24/12 09:42|
|Re:some or all||Kurt Adam||05/24/12 09:50|
|how much and can you||Erik Malund||05/24/12 10:07|
|Options||David Good||05/24/12 10:08|
|Had you read the datasheets ...||Richard Erlacher||05/24/12 09:06|
|sorry||Kurt Adam||05/24/12 09:22|
|I doubt it'll hurt you ...||Richard Erlacher||05/25/12 08:16|
|WOW||Erik Malund||05/25/12 09:48|
|Yes||Per Westermark||05/26/12 03:32|
|Well, it is a troll, as someone has pointed out ...||Richard Erlacher||05/26/12 07:04|
|"his" money||Erik Malund||05/26/12 07:54|
|You're probably right. It's a shame, but it's so||Richard Erlacher||05/26/12 19:31|
|Is that true?||Andy Neil||06/05/12 05:19|
|I doubt it ...||Richard Erlacher||06/05/12 09:55|