Hi all,I'm looking for a single chip solution that integrates an Epson-like (135x family, e.g.) LCD controller and some flash with a modest MCU.The application needs at a minimum of2 bits per pixel and320 by 240 STN LCD control.Similar code and font data on a 80186 consumes around 64k bytes so it needs at least that much flash built-in. The LCD RAM obviously needs to be at least 19.2k but the general purpose RAM could be tiny (1 or 2 kbytes). SPI slave hardware is also required. Pretty modest, no?I'm not interested in an external bus and it can't be BGA. I'm wondering if such a beast exists or if I have to put down an epson and a micro w/ bus to do this job. Production quantities are in the 1k/year range so custom is out... Suggestions?TIA,Bob

"Bob" skrev i meddelandet news:You need a sync serial peripheral which can transfer a continous bitstream of data,preferably without user intervention and then you need to have a number of timers.The AT91SAM7S/X/A3 has the SSC (Synchronous Serial Controller) which isconnected to a double buffered DMA capable of sending up to 64 kB/transfer.The SSC clock can be driven by an external clock signal, which you cangenerate by one of the timers.This reduces the number of interrupts to one per frame.With a 64 kB part, you can double buffer.Note that you are only shifting out one bit at a time, so you may need externalH/W to generate two bit, or you use the SAM7A3, which has 2 x SSCsbut then you have to divide the memory into planes, each handling one bit.This only has 32 kB of SRAM, so you cannot have more than 2 bits per pixel.Other timers can be used to generate the other signals needed by the LCD.Since 19200 * 8 > 65535, you have to prescale the timers before you use them.You are likely to...

MCU w/ integrated graphics LCD controller suggestions?

Jul 26, 2007 23 Replies

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Bob 18 years ago

A good point. We have very long product live cycles so component EOL is a big problem. Parts that don't reach a critical mass tend to be dropped. The AT91SAM7S256 comes in a TQFP64 too and has twice the memory.

Bob

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Ulf Samuelsson 18 years ago

The AT91SAM7x series can support a continuous bitstream at

3,84 Mbps * 2 = 7,68 Mbps with a 50 Hz interrrupt rate with a single SSC. You may need a little external H/W to convert the bitstream to a parallel format, if the LCD display cannot handle 1 bit serial transmission.

Best Regards, Ulf Samuelsson This is intended to be my personal opinion which may, or may not be shared by my employer Atmel Nordic AB

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Ulf Samuelsson 18 years ago

Don't use the SPI, use the SSC.

Best Regards, Ulf Samuelsson This is intended to be my personal opinion which may, or may not be shared by my employer Atmel Nordic AB

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Ulf Samuelsson 18 years ago

The AT32uC3xxx chips were only released a few months ago and production volumes are not here yet (samples are!). The "A" version came in 100+ package, but the "B" version released this summer should be similar to the SAM7S in size.

Best Regards, Ulf Samuelsson This is intended to be my personal opinion which may, or may not be shared by my employer Atmel Nordic AB

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