the love of life

MC68340 and Serial Dataflash via SPI

Discussion created by the love of life on Jan 22, 2007
Latest reply on Jan 24, 2007 by Jeff Smith
Hello,
 
 
Lucky I found out this forum, but I don't know whether FreeScale have some relation to Motorola or not? If yes, may be I found the correct place for my problem. ( I am so newbie to Programming processor so If there is something I am incorrect, please sympathy with me).
 
I need to connect Serial DataFlash to a Motorola MC68340 system (this already is completed product so I don't have chance to change to MCU), and It seem very complicated to me because MC68340 doesn't support SPI. Now I need to make a software SPI (Bit-bang). But some days pass, It haven't worked out yet.

To connect Motorola to SS,SCK,MOSI of Dataflash, I use flip-flop 74hc374 and to connect Motorola to MISO of DataFlash, I use Buffer 74hc244 as following. (Currently, this product use 374 for output and 244 for input, as far as I understand, so I must continue to use these chips to interface.)
_______ __         _______
| moto D0|  ->     |                | ->MOSI
| rola   D1|  ->     |74hc374  | ->SS
|_____ D2| ->     |________| ->CLK

_______ _      ________
| moto D0|   <-|                |<-MISO
| rola        |      |74hc244  |
|_______|       |________|

( What a pity that today I don't bring here my programming source). I am so tired until now It doesn't work. Could anyone tell me whether this hardware can work out? Should I continue with this connections? Could anyone give me some hint for programming bit-bang with this connection because I am so newbie to Motorola.

Any help is highly appreciated.
Many thanks and best regards.

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