Chip for PC Keyboard buffer
Date: Thu, 18 Mar 2004 12:17:59 -0800
Tauno Voipio wrote:
> It is very easy to read a PC keyboard using the Motorola UART MC6850 -
set the divider to 1 to put it into synchronous serial mode and invert
the clock from the keyboard to set its polarity right. You can set it to
interrupt when a full keystroke is received.
The 6850 is obsolete, but there are loads of them around.
Denis
Relevant Pages
- Re: PIC, Keyboard, and USART
... the keyboard codes into the pic and I just want to run this by you guys ... configure the keyboard to something sensible by sending commands to it. ... you'd have to use the clock ... slave mode for tranmission and reception. ...
(sci.electronics.basics) - Re: PIC, Keyboard, and USART
... clock speed properly for tranmission but I figure that it shouldn't be to ... The way I've seen this and used the keyboard is that the keyboard actually ... In section 20.2 EUSART Asynchronous Mode the datasheet says that "Parity ... Is that for asynch mode? ...
(sci.electronics.basics) - Re: Dapper clock and locales
... using English-United States as the installation language, rather than English-United Kingdom. ... The clock was now using the 12Hour system and 12Hour was an item in the clock's preferences menu. ... Changed the keyboard layout in the System -> Administration menu, but it didn't change - the keyboard stayed American. ... There is *no* 12 hour option in the clock's "Preferences" menu, when Dapper is installed using the English - United Kingdom language. ...
(Ubuntu) - Re: PIC, Keyboard, and USART
... The way I've seen this and used the keyboard is that the keyboard actually is always master and provides the clock i.e. tells the PC when it can start sending a command byte. ... But I'm not an AT keyboard specifications guru, maybe the specs provide for a little-known slave mode also. ... Your PIC UART will sync up at the start bit automatically, provided you have set the UART to a fixed 9600 baud and don't use any kind of unreliable "automatic baud rate detection" features. ...
(sci.electronics.basics) - Re: Dapper clock and locales
... using English-United States as the installation language, ... Time Zone to London and altered the clock to read "our time". ... I found that the keyboard was set up as ... layout in the System -> Administration menu, ...
(Ubuntu) |
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