PSD813F2 datasheet(45/110 Pages) STMICROELECTRONICS

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PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2

PSD Interface to a Non-Multiplexed 8-Bit Bus

Figure 20 shows an example of a system using a

MCU with an 8-bit non-multiplexed bus and a

PSD. The address bus is connected to the ADIO

Port, and the data bus is connected to Port A. Port

A is in tri-state mode when the PSD is not access-

ed by the MCU. Should the system address bus

exceed sixteen bits, Ports B, C, or D may be used

for additional address inputs.

Data Byte Enable Reference

MCUs have different data byte orientations. Table

17 shows how the PSD interprets byte/word oper-

ations in different bus WRITE configurations.

Even-byte refers to locations with address A0

equal to '0' and odd byte as locations with A0 equal

to ’1.’

MCU Bus Interface Examples

Figure 21 through 25 show examples of the basic

connections between the PSD and some popular

MCUs. The PSD Control input pins are labeled as

to the MCU function for which they are configured.

The MCU bus interface is specified using the PS-

Dsoft Express Configuration.

Table 17. Eight-Bit Data Bus

Figure 20. An Example of a Typical 8-bit Non-Multiplexed Bus Interface

BHE

D7-D0

Even Byte

Odd Byte

MCU

BHE

ALE

RESET

D [ 7:0]

A[ 15:0]

A[ 23:16]

D [ 7:0]

ADIO

PORT

WR (CNTRL0)

RD (CNTRL1)

BHE (CNTRL2)

RST

ALE (PD0)

PORT D

(OPTIONAL)

PSD

AI02879C

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