todo

The disadvantages to using interrupt priorities are many:

More interrupt setup code
More complex ISR declaration
Higher latency for high-priority interrupts due to the necessary springboard GOTO
Much higher latency for low-priority interrupts since they can't use the fast register stack
Increased code space usage due to all of the above.
More hardware and software stack space is required.

Kamstrup

http://kamstrup.se/media/504/file.pdf
Baud rate Max. 2400 bit/sek

http://www.kamstrup.com/media/2105/IEC61107_comprotocol.pdf

Readout by the use of IEC1107 is in mode A.
Communication with the meter uses serial communication according to the RS232 standard. Setup for serial communication is 300 baud, 1 start bit, 7 data bits, even parity and 1 stop bit.

disable interrupts during interrupt handler processing

- data compression
- eeprom save