Tom Vijlbrief
60b168c146
[AVR] Simplify SPWRITE on XMEGA ( #147210 )
...
It is unnecessary to disable/restore interrupt when writing to the SPH/SPL
pair on XMEGA devices, as the manual indicates:
```
To prevent corruption when updating the stack pointer from software,
a write to SPL will automatically disable interrupts for up to four instructions
or until the next I/O memory write.
```
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