Although the ATmega164/ATmega324 and ATmega644 were originaly advertised as a feature-compatible sub-family, their feature sets were not actually identical. Unlike the advance specs for the ATmega164/ATmega324, there was never a second USART in the ATmega644.
Of course, now all three chips have been cancelled, and the ATmega164P/ATmega324P/ATmega644P are planned. And they apparently will have equal feature sets, notably, each will have two USARTs.
Atmel's plans for mega644 vs. 644P?
Atmel's plans for mega644 vs. 644P?
I saw this on AVRfreaks.net... does it impact the ZBasic "a" products?
In the short term, no. In the longer term, possibly. It is unlikely that Atmel will discontinue the mega644 until the mega644P is in production (currently projected 2Q07). We plan to get mega644P samples as soon as they are available (projected 1Q07).
It appears that the changes required to port from the mega644 to the mega644P are relatively simple. As a bonus, you get a second hardware UART. We anticipate implementing this in ZBasic as Com2.
It appears that the changes required to port from the mega644 to the mega644P are relatively simple. As a bonus, you get a second hardware UART. We anticipate implementing this in ZBasic as Com2.
- Don Kinzer