I recall having similar problems when I was writing my programmer based on
the uChip documentation, which indeed is wrong at this point. Someone on the
piclist helped me out (I don't rememer his name), so maybe I can pass on the
magic. I do not recall the correct command sequence itself, but the erase
fragment in my WISP programmer is shown below. It uses some weird macro's,
but I think you will be able to deduct the correct command sequence. When
you have done so, do not forget to post it on picfaq/techref!
Wouter

command_program_erase
 ; remove protection
 move_const_via_w_to H'03', data1
 move_const_via_w_to H'0F', data2
 move_const_via_w_to H'0F', data3
 move_const_via_w_to H'0F', data4
 output_command_const H'00'
 call output_data
 move_const_via_w_to D'07', count1
increment_loop
 call command_increment
 decfsz count1, f
  goto increment_loop
 output_command_const H'01'
 output_command_const H'07'
 output_command_const H'08'
 call wait_for_target
 output_command_const H'01'
 output_command_const H'07'
 ; erase data memory
 call reset_target
 move_const_via_w_to H'00', data1
 move_const_via_w_to H'00', data2
 move_const_via_w_to H'0F', data3
 move_const_via_w_to H'0F', data4
 output_command_const H'03'
 call output_data
 output_command_const H'08'
 call wait_for_target
 output_command_const H'0B'
 output_command_const H'08'
 call wait_for_target
 return

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