9S12A256 vs 9s12A256B?

[GaryOlmstead]

Hi--

I'm switching to the  9S12A256, and am trying to find out what the difference is between the A256 and A256B.  I have the Device User Guides for both chips, but neither are any  help at all.  I suspect I need a Data Sheet, but I can't find it.  There is a zip file called MC9S12A256B Data Sheet, but it is really the Device User Guide.

Is there a document that explains the difference(s)?

[lama · Accepted solution]

Hi,

The answer I have created in 2008:

They A256B and A256 are fully compatible. The differences are:

1) The mask set and related errata.

MC9S12A256B mask set 1K79X, 2K79X
MC9S12A256 mask set 0L01, 0L91, 3L91, and 4L91

2) The oscillator configuration

MC9S12A256B mask set 0K79X, 1K79X - Colpitts/ External
MC9S12A256 mask set L91N, L01Y - Pierce/ Colpitts/ External

3) The FLASH and the EEPROM data retention

Older part: A256B has 10 flash E/W cycles endurance with data retention time 15 years and 10,000 EEPROM E/W cycles with data retention 5 years for temperature range -40~125 deg.C.

Newer part: A256 has 10,000 flash E/W cycles (new flash technology=> new flash properties)
Flash E/W cycles endurance is from 10,000 (typically 10,000)
EEPROM E/W cycles endurance is from 100,000 at -40deg.C

SPI module problem (A256): You have to read the SPISR register at the top of your code before you initialize SPI.

There is a package from my drawer or you can also go to:

https://www.nxp.com/products/processors-and-microcontrollers/additional-mpu-mcus-architectures/16-bi...

Best regards,

Ladislav

[GaryOlmstead]

Thanks, Vladislav!!

Gary