Reading Microchip EEPROM (serial/SSP/microwire)

pszemol — Thu, 10 Nov 2016 22:18:37 GMT

I can use some help, guys...

I am interfacing LPC1788/LPC4088 cpu to a 1kbit Microchip serial EEPROM (93C46B).

I see the SSP controller can be configured to work in the "microwire" mode... cool.

How do I transmit 9 bits to the EEPROM to issue its READ command?

EEPROM datasheet requires me to send 1 as a start bit then the READ opcode '10' (2 bits) and then A5..A0 bits of address (total of 9 bits) and then 16 clocks to allow the slave chip to output 16 bits of data.

Check out page 5 of http://ww1.microchip.com/downloads/en/DeviceDoc/20001749K.pdf

How do I configure the SSP in cpu for such operation?

Do I set Control Register's DSS bits to 9 bits transfer? 16 bits transfer?

Any other way to make this CPU and this EEPROM talk without bit-banging on gpios?

Anybody with a clue? :-)

Re: Reading Microchip EEPROM (serial/SSP/microwire)

jeremyzhou — Tue, 15 Nov 2016 03:07:25 GMT

Hi pszemol pszemol,

Thank you for interest in NXP Semiconductor products and the opportunity to serve you.

I'd highly recommend you to set the SPI format and 16-bit transfer.

Hope it helps.
Have a great day,
Ping

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LPC Microcontrollers中的主题 Reading Microchip EEPROM (serial/SSP/microwire)

Reading Microchip EEPROM (serial/SSP/microwire)

Re: Reading Microchip EEPROM (serial/SSP/microwire)