ZPSD211R-B-15J STMICROELECTRONICS [STMicroelectronics], ZPSD211R-B-15J Datasheet - Page 18

• Manufacturer Part Number: ZPSD211R-B-15J
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

10.0
I/O Port
Functions
(Cont.)
Figure 7. Port C (PC0-PC2) Pin Structure
NOTES: 1. Port C pins can be individually configured as inputs or outputs, but not both.
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:
Notes:
1) If the inputs are addresses, they are routed to PAD A and B, and can be used in any or
2) If the inputs are logic, they are routed to PAD B and can be used for Boolean equations
3) If Port C pins are configured as inputs, they can not be individually configured as
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.
•
•
all PAD equations.
that are implemented in any or all of the CS0-CS10 PAD B outputs.
address or logic and latched or transparent. They must be configured as a group to be
address or logic and latched or transparent.
From PAD
To PAD
Whether they are address or logic inputs
Whether the input is transparent or latched by the trailing edge of ALE/AS.
A16/A17/A18
2. PSDsoft sets this configuration prior to run-time based on your PSDsoft design file.
Latched Address
CS8 / CS9 / C S10
Input
Logic Input
Q
En
D
ALE
PSDsoft
M
D
E
U
X
2
Set by PSDsoft
Input or Output
Chip Select Out
(PC0/ PC1/PC2)
2
Address In or
PSD211R Family
Port C I/O
1
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