Foundations of Embedded Systems
A Term Spring 2008
Lecture #6: More Digital I/O
using the MSP430F449
Reading for Today:
MSP430x4xx User Guide Ch 9
Reading for Next Class:
Keypad datasheet, MSP430x4xx User Guide Ch 9,
Homework #2 is on Web:
Due Thursday 9/11/08
Lab #0: Report due 9/9/2008 in class
Last class
: Specifics of the MSP430F449 memory organization
This class
: Embedded systems read from and write to Ports to perform I/O. Embedded
system designers usually have to implement these low-level IO routines themselves.
MSP430F449 Basic Digital I/O
Inputting or outputting logic levels to the pins of the MSP430 package
>>
Six independent, individually configurable digital I/O
ports
>> Each port is 8 bits wide
>> Each pin of each port can be configured individually as input or output
>> Each pin of each port can be individually read from or written to
>> Ports 1 and 2 can generate
interrupts
which are control signals that can be accepted or
ignored by the '430
-- We'll be using interrupts later in the term
>> Each port is controlled by four byte-addressable (i.e. 1 byte wide) registers
>> All the I/O port registers are
memory mapped
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- Fall '08
- Jarvis
- peripheral device, digital i/o, embedded system, digital i/o ports
-
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