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Mid-Frame Bursts
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The Robman
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Joined: 01 Aug 2003
Posts: 19517
Location: Chicago, IL

PostPosted: Thu Jul 08, 2010 12:54 pm    Post subject: Reply with quote

The calls to the $0161 vector set the mid-frame burst to the following settings, then it jumps to the regular engine.

ON: from the ONE pair
OFF: from the leadin pair.

The alternative is to set bit3 in W7 (ie, BITS W7.3) and then call $0146. In this case, the mid-frame burst will be a repeat of the leadin pair.

But, you can customize the mid-frame pair by loading the timing data into RD0/RD1(on time) and RD2/RD3(off time).

So, the code would be:
ld w0, #D0h
ld @w0,pd10
inc w0
ld @w0,pd11
inc w0
ld @w0,pd04
inc w0
ld @w0,pd05
JP 0146h

If the 4 bytes of timing data are sequential, you could also do this to set up RD0:

LD W0,#1Eh ;set FROM register to R1E (leadin times)
LD W1,#D0h ;set TO register to RD0 (mid-frame burst)
LD W2,#04h ;set #bytes to 4
CALL 015Bh ;copy 4 bytes from R1E to RD0 (mid-frame burst)
BITS W7.3 ;turn on mid-frame burst
LD R25,#19h ;set mid-frame burst position to 25
CALL 0146h ;send signal

Here, the following code is used to create a normal mid-frame burst:

MOV #$09, $7D

So, here's what the HCS08 version of the custom code would be:

MOV #$09, $7D
LDHX pd10 (where pd10 is the custom ON time)
LDHX pd04 (and pd04 is the custom OFF time)
Please don't PM me with remote questions, post them in the forums so all the experts can help!
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