ZPSD412A1-C-15J View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ZPSD412A1-C-15J Datasheet PDF : 123 Pages
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PSD4XX Family
The PSD4XX
Architecture
(cont.)
9.3.10 Port A – Functionality and Structure
Port A is the most flexible of all the I/O ports. It can be configured to perform one or more
of the following functions:
t Standard MCU I/O Mode
t PLD I/O
t Address Out – latched address lines A[0-7] are assigned to pins PA[0-7].
t Address In – input port for other address lines, inputs can be latched by ALE.
t Peripheral I/O
Figure 27 shows the structure of a Port A pin. If the pin is configured as an output port,
the multiplexer selects one of its three inputs as output. If the pin is configured as an input,
the input connects to :
1. Data In Register as input in Standard MCU I/O Mode
or
2. PA Macrocell as PLD input
or
3. PA Macrocell through a latch latched by ALE, as Address In input.
9.3.11 Port B – Functionality and Structure
Port B is similar to Port A in structure. It can be configured to perform one or more of the
following functions:
t Standard MCU I/O Mode
t PLD I/O
t Address Out – address lines A[0-7] for 8-bit multiplexed bus or address lines
A[8-15] for 16-bit multiplexed bus are assigned to pins PB[0-7].
Figure 28 shows the structure of a Port B pin. If the pin is configured as an output port,
the multiplexer selects one of its three inputs as output. If the pin is configured as input,
the input connects to :
t Data In Register as input in Standard MCU I/O Mode
or
t PB Macrocell as PLD input
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