User manual

Geo Brick Drive User Manual

Pinouts and Software Setup 54

The output frequency control Ixx69 specifies the maximum command output value that corresponds to the

maximum PFM Frequency.

I6826=3 ; MACRO IC Channel2 Output Mode Select. C PFM

M8000->Y:$7841C,8,16,S ; Supplementary Channel 2* Output C Command Value

; Min=0, Max= Calculated Ixx69

M8001->X:$7841D,21 ; Invert C Output Control. 0=no inversion, 1=invert

Testing The J9 PFM Output

Writing, directly to the suggested M-variable (i.e. M8000), values proportional to the calculated Ixx69,

produces the following corresponding frequencies:

M8000

PFM [KHz]

1213

2427