low cost microcontroller with RS32

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lim Contact options for registered users 's Avatar (by Gravatar) posted on
March 14, 2007, 9:24 am
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Hi
I'm trying to build a simple system with a microcontroller and 2 RS232
ports to receive data on 1 port and send out new data on the 2nd port

requirements are
1. 2x RS232 UART port, configurable comm settings
2. 64k internal memory to store the RS232 strings database
3. 2x 8 bit IO port to select options using 8bit dip switches

I've worked with an 8051 many years ago and from what I've been reading
again, it looks like it should do the job quite well.

any advice? a development kit would help too.

thanks
Lim

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TT_Man Contact options for registered users 's Avatar (by Gravatar) posted on
March 14, 2007, 1:08 pm
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Re: low cost microcontroller with RS32



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Looks fine, use the 89C51ed2 from Atmel- 64K internal flash +eeprom etc.Will
boot load your code over the RS232 post as well!



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Maciej Sawicki Contact options for registered users 's Avatar (by Gravatar) posted on
March 14, 2007, 8:46 pm
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Re: low cost microcontroller with RS32



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Have a look at various Zilog parts.

Maciek.

Prescott Contact options for registered users 's Avatar (by Gravatar) posted on
March 15, 2007, 12:19 am
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Re: low cost microcontroller with RS32


Dallas Semiconductor / Maxim  used to make an 8051 derivative with 2 serial
ports (320?)

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TT_Man Contact options for registered users 's Avatar (by Gravatar) posted on
March 15, 2007, 11:16 am
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Re: low cost microcontroller with RS32



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Yes Dallas 89c450 is 64 k part2k ram with dual rs232's also has a boot
loader via rs232. marvellous chip



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Ryan Weihl Contact options for registered users 's Avatar (by Gravatar) posted on
March 15, 2007, 3:42 am
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Re: low cost microcontroller with RS32



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I used to use the Dallas DS2252(T), serial in/out on TI/TX and bitbang
on p1.x for the other port. With the internal ram you can compensate
for speed problems.

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