PSD4235G2-12UT datasheet(85/124 Pages) STMICROELECTRONICS

Part #	PSD4235G2-12UT

Description	Flash in-system programmable (ISP) peripherals for 16-bit MCUs (3.3 V supply)

PDF	124 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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85 / 124 page

PSD4235G2V

I/O ports

85/124

Figure 28.

Port A, B and C structure

19.22

Port D - functionality and structure

Port D has four I/O pins. See Figure 29. Port D can be configured to perform one or more of

the following functions:

●

MCU I/O mode

●

CPLD input - direct input to the CPLD, no input macrocells (IMC)

Port D pins can be configured in PSDsoft Express as input pins for other dedicated

functions:

●

Address Strobe (ALE/AS, PD0)

●

CLKIN (PD1) as input to the macrocells Flip-flops and APD counter

●

PSD Chip Select input (CSI, PD2). Driving this signal high disables the Flash memory,

SRAM and CSIOP.

●

Write Enable high-byte (WRH, PD3) input, or as DBE input from a MC68HC912.

DATA OUT

MCELLA7-MCELLA0 (Port A)

MCELLB7-MCELLB0 (Port B)

Ext.CS (Port C)

ENABLE PRODUCT TERM (.OE)

READ MUX

CPLD - INPUT

DIR Register

INPUT

MACROCELL

ENABLE OUT

DATA IN

OUTPUT

MUX

PORT Pin

DATA OUT

AI04936

OUTPUT

SELECT

PSD4235G2-12UT Datasheet(PDF) 85 Page - STMicroelectronics

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