Setting the Geneve clock
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The following routine can be used to reset the clock to a well-defined state, and then the date may be set using the MDOS command TIME.
* Resetting the clock to 24h mode
* according to the MM58274C datasheet
* Time must be set afterwards using the MDOS command TIME
DEF START
START LWPI >F000
LI R0,>0F00
MOVB R0,@>F130 // Write 0x0f into the control register
SWPB R0
MOVB R0,@>F13F // Write 0x00 into the interrupt register
LI R0,>0500
MOVB R0,@>F130 // Write 0x05 into the control register
LI R0,>0100
LI R1,>F131
LI R2,14
LP01 MOVB R0,*R1+ // Write 0x01 to all registers
DEC R2
JNE LP01
MOVB R0,@>F13F // Set 24h mode
CLR R0
MOVB R0,@>F130 // Write 0x00 into the control register
BLWP @0
END