AN2125 View Datasheet(PDF) - STMicroelectronics
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MFG CO.
'AN2125' PDF : 68 Pages View PDF
uPSD3300 Series Design Guide for DK3300-ELCD Using KEIL
Figure 33. Design Assistant Chip select equations (csboot3)
8. Click on psel0. This address range specifies when Port A pins behaves like a data bus
repeater in Peripheral I/O Mode to drive the ELCD module. Port A pins were earlier
specified a "Peripheral I/O Mode" which acts like a 245 bus transceiver chip connecting the
8032 data bus to external peripherals over a given address range specified by the label
psel0 or psel1. The direction of this transceiver function is controlled automatically in silicon
by the 8032 _rd and _wr signals (see the full uPSD datasheet for details). All you have to
do is click on psel0 and enter the address range 7E00-7EFF to enable this feature for that
address range as shown in Figure 19, with no Page Number assignment. psel1 is not
needed because the Peripheral I/O feature is active for the logical OR of psel0 or psel1.
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