Are interrupts enabled by default in OpenMSP430, where is this defined in the code, apart from the watchdog enable/disable flag in _defines.v
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In any msp430 I remeber gie is not enabled by default. The same seems to happen in OpenMSP430, see omsp_register_file.v
always @(posedge mclk_r2 or posedge puc_rst)
if (puc_rst) r2 <= 16'h0000;