Subject:
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Re: Addresses of SPI ports
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 20 May 1998 07:28:56 GMT
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Original-From:
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Thomas Hauri <har@twi%stopspammers%.ch>
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Viewed:
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1169 times
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Hi
The SPI Header is connected to port D of the hc11 as follows:
Port D Bit 2 - PD2 - MISO
Port D Bit 3 - PD3 - MOSI
Port D Bit 4 - PD4 - SCK
Port D Bit 5 - PD5 - SS
All of those pins can be used for general-purpose I/O signals.
To program port D you have the following registers:
* DDRD (Data Direction Register Port D) $1009
For output set the corresponding bit to 1.
All bits 0 (input) after reset.
* PORTD (POrt D Data) $1008
Read or Write data through this register.
* SPCR (Serial Peripheral Control) $1028
Make sure that the SPI is turned off.
Bit 7 and Bit 6 of this register must be cleared (0).
Bit 7 - SPI interrupt
Bit 6 - SPI enable
With bit 5 (DWOM) you can control the Port D mode
(Port D Wired-OR Mode option)
DWOM = 0 Normal CMOS outputs
DWOM = 1 Open-drain outputs
For further information about port D please refer to the HC11A8 technical
manual.
http://www.mcu.motsps.com/cgi-bin/Lit?Table=HC11&Type=USER
it's the pdf or ps file MC68HC11A8/D
Hope that helps.
Tom
> Hello. I was wondering if anyone knows all 4 addresses for all 4 ports of
> SPI header. Thank you
> --
> *************************************
> * Arthur Tretyak *
> * or just Arturchik *
> * a-tretyak@nwu.edu *
> *************************************
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