PSD933312MIT 查看數據表（PDF） - STMicroelectronics

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PSD933312MIT

Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V

STMicroelectronics 

PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2

External Chip Select

The CPLD also provides three External Chip Se-

lect (ECS0-ECS2) outputs on Port D pins that can

be used to select external devices. Each External

Chip Select (ECS0-ECS2) consists of one product

term that can be configured active High or Low.

The output enable of the pin is controlled by either

the output enable product term or the Direction

Register. (See Figure 31.)

Figure 31. Port D External Chip Select Signals

ENABLE (.OE)

DIRECTION

REGISTER

PT0

POLARITY

BIT

ENABLE (.OE)

PT1

POLARITY

BIT

ENABLE (.OE)

PT2

POLARITY

BIT

ECS0

PD0 PIN

DIRECTION

REGISTER

ECS1

PD1 PIN

DIRECTION

REGISTER

ECS2

PD2 PIN

AI02890

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