psd311-b-90ui STMicroelectronics, psd311-b-90ui Datasheet - Page 12

• Manufacturer Part Number: psd311-b-90ui
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMicroelectronics

Table 2.
PSD3XX Pin
Descriptions
(cont.)
Legend:
AD10/A10
AD12/A12
AD13/A13
AD14/A14
AD15/A15
AD11/A11
AD0/A0
AD1/A1
AD2/A2
AD3/A3
AD4/A4
AD5/A5
AD6/A6
AD7/A7
AD8/A8
AD9/A9
Name
GND
PC0
PC1
PC2
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
V
CC
The Type column abbreviations are: I = input only; I/O = input/output; P = power.
Type
I/O
I/O
I/O
I/O
P
P
These pins make up Port B. These port pins are configurable, and
can have the following functions: (see Figure 6)
1. MCU I/O —in this mode, the direction of the pin is defined by its
2. Chip select output —each of PB0-3 has four product terms
3. CMOS or open-drain.
4. If your MCU is non-multiplexed, and the data bus width is
These pins make up Port C. These port pins are configurable, and
can have the following functions (see Figure 7):
1. PAD input—when configured as an input, a bit individually
2. PAD output—when configured as an output (i.e. there is an
If your MCU is multiplexed:
These pins are the multiplexed, low-order address/data byte
(AD0-AD7). As inputs, address information is latched by the ALE/AS
signal and used internally by the PSD. The pins also serve as MCU
data bus inputs or outputs, depending on the MCU control signals
(RD, WR, etc.).
If your MCU is non-multiplexed:
These pins are the low-order address inputs (A0-A7)
If your MCU is multiplexed with a 16-bit data bus:
These pins are the multiplexed, high-order address/data byte
(AD8-AD15). As inputs, address information is latched by the
ALE/AS signal and used internally the PSD. The pins also
serve as MCU data bus inputs or outputs, depending on the MCU
control signals (RD, WR, etc.).
If your MCU is non-multiplexed or has a 8-bit data bus:
These pins are the high-order address inputs (A8-A15).
Ground Pin
Supply voltage input.
direction bit, which resides in the direction register.
available per pin, while PB4-7 have 2 product terms each.
See Figure 4.
16 bits: data bus input—connect your data bus (D8-D15) to these
pins. See Figure 3.
becomes an address or a logic input, depending on your PSDsoft
design file. When declared as an address, the bit(s) can be latched
with ALE/AS.
equation written for it in your PSDsoft design file), there is one
product term available to it.
Description
PSD3XX Family
9