PSD834210MIT datasheet(51/89 Pages) STMICROELECTRONICS

部件名	PSD834210MIT

功能描述	Flash PSD, 3.3V Supply, for 8-bit MCUs 2 Mbit 256 Kbit Dual Flash Memories and 64 Kbit SRAM

PDF	89 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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51 / 89 page

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PSD834F2V

Figure 25. Port A and Port B Structure

Ports A and B – Functionality and Structure

Ports A and B have similar functionality and struc-

ture, as shown in Figure 25. The two ports can be

configured to perform one or more of the following

functions:

MCU I/O Mode

CPLD Output – Macrocells McellAB7-McellAB0

can be connected to Port A or Port B. McellBC7-

McellBC0 can be connected to Port B or Port C.

CPLD Input – Via the Input Macrocells (IMC).

Latched Address output – Provide latched

address output as per Table 20.

Address In – Additional high address inputs

using the Input Macrocells (IMC).

Open Drain/Slew Rate – pins PA3-PA0 and

PB3-PB0 can be configured to fast slew rate,

pins PA7-PA4 and PB7-PB4 can be configured

to Open Drain Mode.

Data Port – Port A to D7-D0 for 8 bit non-

multiplexed bus

Multiplexed Address/Data port for certain types

of MCU bus interfaces.

Peripheral Mode – Port A only

DATA OUT

REG.

ADDRESS

MACROCELL OUTPUTS

ENABLE PRODUCT TERM (.OE)

ALE

READ MUX

CPLD - INPUT

CONTROL REG.

DIR REG.

INPUT

MACROCELL

ENABLE OUT

DATA IN

OUTPUT

SELECT

OUTPUT

MUX

PORT

A OR B PIN

DATA OUT

ADDRESS

A[ 7:0] OR A[15:8]

AI02887

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