What is difference between MSP430 and MSP430X?

Question

Any comparison table available?

score 5 · Answer 1 · edited Mar 25 '12 at 07:30

The basic change for the 430X architecture was to introduce a 20 bit address range to allow addressing outside the 64K available on the original 430 devices. There are a new set of instructions that operate on the 20 bit address in parallel with the old style 16 bit instructions. e.g.

CALL  ; takes a 16 bit address    
CALLA ; takes a 20 bit address

PUSH  ; Push the bottom 16 bits of a register onto the stack
PUSHA ; Push the full 20 bit register

The existing code compiled for a 430 based processor will run within the bottom 64K address space of the 430X processor. In the development tools (IAR and probably Rowley) you can specify a memory model so that the longer function calls and other 430X specific instructions are not generated if you ensure that your code does not cross the 64K boundary.

Thanks buddy, I appreciate your response. It is really helpful. — Adnan, Aug 06 '10 at 10:46
Reference for 20 bits (*not* 24) bits: http://en.wikipedia.org/wiki/TI_MSP430#MSP430X_20-bit_extension — David Wolever, Mar 25 '12 at 07:15

score 3 · Answer 2 · answered Aug 04 '10 at 10:37

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Wikipedia's usually good for this sort of thing. It looks like it's to increase the address space to 1MB on the X from 64K on the regular.

http://en.wikipedia.org/wiki/MSP430#MSP430X_20-bit_extension

answered Aug 04 '10 at 10:37

Rup

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Thanks buddy, I appreciate your response. It is really helpful. – Adnan Aug 06 '10 at 10:39
Ian's is better than mine. You should click the tick outline next to his question to accept that as the answer. Thanks! – Rup Aug 06 '10 at 18:08

score 0 · Answer 3 · answered Sep 28 '10 at 11:42

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The MSP430X extension has only 20 bit address space. So the CALLA takes only a 20 bit address.

answered Sep 28 '10 at 11:42

Thomas Weber

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What is difference between MSP430 and MSP430X?

3 Answers3