PSD312 datasheet(23/85 Pages) STMICROELECTRONICS

23 / 85 page

PSD3XX Family

CS8 / CS9 / C S10

From PAD

To PAD

A16/A17/A18

Latched Address

Input

Logic Input

Address In or

Chip Select Out

Input or Output

Set by PSDsoft

PSDsoft

Port C I/O

(PC0 / P C1/ P C2)

ALE

NOTES: 1. Port C pins can be individually configured as inputs or outputs, but not both. Pins can be individually

configured as address or logic and latched or transparent, except for the 3X1 devices, which must be

set to all address or all logic.

2. PSDsoft sets this configuration prior to run-time based on your PSDsoft design file.

Figure 7. Port C (PC0-PC2) Pin Structure

10.4 Port C (PC0-PC2)

Each pin of Port C (Figure 7) can be configured as an input to PAD A and PAD B, or as an

output from PAD B. As inputs, the pins are referenced as A16-A18. Although the pins are

given this reference, they can be used for any address or logic input. [For example, A8-A10

could be connected to those pins to improve the resolution (boundaries) of CS0-CS7 to 256

bytes.] How they are defined in the PSDsoft design file determines:

• Whether they are address or logic inputs

• Whether the input is transparent or latched by the trailing edge of ALE/AS.

Notes:

1) If the inputs are addresses, they are routed to PAD A and PAD B, and can be used in

any or all PAD equations.

2) A logic input is routed to PAD B and can be used for Boolean equations that are

implemented in any or all of the CS0-CS10 PAD B outputs.

Alternately, PC0-PC2 can become CS8-CS10 outputs, respectively, providing the user with

more external chip-select PAD outputs. Each of the signals (CS8-CS10) is comprised of

one product term.

10.

I/O Port

Functions

(cont.)

10.5 ALE/AS Input Pin

The ALE/AS pin may be used as a generic logic input signal to the PADs if a

non-multiplexed MCU configuration is chosen in PSDsoft.

PSD312 Datasheet(PDF) 23 Page - STMicroelectronics

PSD312 Datasheet(HTML) 23 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85

Datasheet Descarga

Enlace URL