Z85233 Datasheet, PDF (274/317 Pages) Zilog, Inc. – The Zilog SCC Serial Communication Controller

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Application Note
Technical Considerations When Implementing LocalTalk Link Access Protocol
532
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580 finscc:
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pop
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pop
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pop
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ret
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0ffh
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af
;WR10
;crc preset to one,fm0, flag idle/undr
;WR11
1
;rtxc=xtal,rxc=dpll,txc=brg,trxc=brg out
;WR12
;brg tc low,for 230.4kbps using rtxc=3.68MHz
;WR13
;brg tc high
;WR14
;disable dpll
;no local loop back,brg source=rtxc
;WR14
;select fm mode
;no local loop back,brg source=rtxc
;WR14
;dpll source=rtxc,
;no local loop back,brg source=rtxc
;WR14
;enter search mode
;no local loopback
;WR14
;null,no local loopback,enable the brg
;WR3
;rx 8b/c,enable rx crc,addrs src,rx disable
;WR15
;ext/stat not used
;WR0
;reset ext/stat once
;reset ext/stat twice
;WR1
;disable all int sources
;WR9
;enable int
;finished
;
;
;
UM010901-0601
6-139