mwedel@hobbes.uucp (Mark Wedel) (08/04/89)
I am doing some programming for this device, but the documentation I have for it leaves me with one question. For the Command register, the documentation for bits 2-3 (the bit numbering is 0-7) leaves me wanting more information. Here is the description I have for it: 2-3 Control transmit interrupt, Request to Send (RTS) level, and transmitter. What I want is something that describes what to write to each bit to get a desired result (send byte, control of RTS, and so forth.) Any help appreciated. Mark Wedel mwedel@antares.Tymnet.Com !ucbvax!hplabs!oliveb!tymix!antares!mwedel
Ric@cup.portal.com (Richard Knowles Rainbolt) (08/05/89)
According to the Rockwell manual: Bit # 3 2 Mode 0 0 RTS* high, transmitter disabled 0 1 RTS* low, transmitter interrupt enabled 1 0 RTS* low, transmitter interrupt disabled 1 1 RTS* low, trans interrupt disabled, Transmit Break on TxD. Hope this helps! -Ric- (Ric@cup.portal.com)
matthew@sunpix.UUCP ( Sun Visualization Products) (08/07/89)
In request for more info on the 6551 ACIA command register, Heres some info from data sheets on the 6551. Command Register: Bit 7 6 5 [Parity Control] - - 0 Parity disabled - No parity bit generated. None received. 0 0 1 Odd parity received and transmitted 0 1 1 Even parity received and transmitted 1 0 1 Mark parity sent, receive parity check disabled 1 1 1 Space parity sent, receive parity check disabled Bit 4 [Echo Control] 0 Normal 1 Echo (bits 2 and 3 must be zero) Bit 3 2 [Transmitter Control] 0 0 Transmit Interupt disabled. RTS* = High, Transmitter = off 0 1 Transmit Interupt enabled. RTS* = Low, Transmitter = on 1 0 Transmit Interupt disabled. RTS* = Low, Transmitter = on 1 1 Transmit Interupt enabled. RTS* = Low, Transmitter = BREAK Bit 1 [IRQ Control] 0 IRQ* interrupt enabled from bit 3 of status word. 1 IRQ* interrupt disabled. Bit 0 [DTR Control] 0 Disable receiver and all interrupts. (DTR* high) 1 Enable receiver and all interrupts. (DTR* low) -- Matthew Lee Stier | Sun Microsystems --- RTP, NC 27709-3447 | "Wisconsin Escapee" uucp: sun!mstier or mcnc!rti!sunpix!matthew | phone: (919) 469-8300 fax: (919) 460-8355 |