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To write an instruction word, set up the address in the Z-pointer and data in R1:R0, write
“00000001” to SPMCR and execute SPM within four clock cycles after writing SPMCR.
The content of PCWORD in the Z-register is used to address the data in the temporary
buffer. The temporary buffer will auto-erase after a page write operation or by writing the
RWWSRE bit in SPMCR. It is also erased after a System Reset. Note that it is not possible
to write more than one time to each address without erasing the temporary buffer.
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