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发表于 2009-11-4 09:02:27
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Initialize
Set all pins (except GND, VCC, EDIT and SDOUT of course) of the GAL to L, except STB- which should stay H.
Read (16V8/20V8) at 12 volt on EDIT:
Set P/V- to L, set up the desired pattern on RA0..RA5, bring STB- for a short time (1-10us) to L and again up to H, read bit from SDOUT, bring SCLK to H for a short time (1-10us) and back to L and read the next bit until all bits of this line are read.
Write, Erase, Security fuse (16V8/20V8) at VPP volt on EDIT
Set P/V- to H, set up the desired pattern on RA0..RA5, apply first bit to SDIN, bring SCLK for a short time to H and back to L, and transfer the next bit until all bits of this line have been transferred. Bring STB- to L and wait for the programming pulse time before you take it back to H again. Restore P/V- to L at the end of the operation. |
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