AN2125 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'AN2125' PDF : 68 Pages View PDF
uPSD3300 Series Design Guide for DK3300-ELCD Using KEIL
7.1 Pin Definitions
You will be shown the Pin Definitions screen. The entry is normally a 3-step process:
1. Select the pin based upon the selected device output.
2. Add or update the pin function and features, name as shown the second portion.
3. Complete all pin definitions and then continue to the next step.
Since the example design is completed, this will show all the pin definitions as shown in the
block diagram (Figure 18).
Click through the pins and see how they are configured and how they relate to the design.
You will notice that upon clicking on the radial button the associated pin name is shown in the
Step-2 portion and identifies how the pin function is configured (whether as CPLD input/ output
or as other mode.)
For the sample design, the key signal names will be shown as related to interfacing with ELCD
screen and their relationship to Design block diagram. (Refer to the Block diagram and the
LCD pin connections: Figure 18 and Figure 19. See that they are similar for the design)
You will also notice that you cannot change the definition of some pins because they have a
fixed function. PSDsoft already take cares of this.
In this design the pin configurations for Port A and Port B[1..4] are shown below.
Port A should be in the Peripheral mode; (Figure 24)
Port B, pins 1 and 2 should be in the Combinational Logic Output mode (Figure 25)
and Port B, pins 3 and 4 should be in the External Chip-Select, Active-High mode (Figure 26).
Here is a sample of each:
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