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I could uses Any advice you have on how to included an 8255PPI in the memory map of a HC11F1 as is on the nmix 022 board from NEwmicros. Could you please help me?

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8255 is an 'intel style' interface with /rd and /wr lines. There are a bunch of app nots showing how to hook intel chips to motorola cpus and vice versa. HC11 has a r/w line and address strobe. You need to convert these to /wr and /rd with a couple of 7400 nand gates [Non-text portions of this message have been removed]

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the easiest way is to use a 74hc138 and connecti it so you can place the memory and the E/S devices at the same time in the memory map. In this case, you'll have many images of the 8255 chip, because it uses only 4 registers. gompertm <> wrote:I could uses Any advice you have on how to included an 8255PPI in the memory map of a HC11F1 as is on the nmix 022 board from NEwmicros. Could you please help me? Yahoo! Groups SponsorADVERTISEMENT To unsubscribe from this group, send an email to: Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. ---------------------------------     Antivirus • Filtros antispam • 6 MB gratis     ¿Todavía no tienes un correo inteligente? [Non-text portions of this message have been removed]

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At 12:33 PM 12/11/03 EST, you wrote: >8255 is an 'intel style' interface with /rd and /wr lines. There are a bunch >of app nots showing how to hook intel chips to motorola cpus and vice versa. >HC11 has a r/w line and address strobe. You need to convert these to /wr and >/rd with a couple of 7400 nand gates Also UNLESS you MUST use the 8255 you can use the 6821 which is a Motorola creature. I like the 8255 and have used it a lot in the past. Regards John Samperi ****************************************************** Ampertronics Pty. Ltd. 11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA Tel. (02) 9674-6495 Fax (02) 9674-8745 Email: Website http://ampertronics.com.au * Electronic Design * Technical Services * Contract Assembly ******************************************************

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