PSD834F2V datasheet(39/89 Pages) STMICROELECTRONICS

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PSD834F2V

Figure 17. An Example of a Typical 8-bit Non-Multiplexed Bus Interface

Data Byte Enable Reference. MCUs have differ-

ent data byte orientations. Table 15 shows how

the PSD interprets byte/word operations in differ-

ent bus write configurations. Even-byte refers to

locations with address A0 equal to 0 and odd byte

as locations with A0 equal to 1.

Table 15. Eight-Bit Data Bus

Figure 18. MCU Bus Interface Examples

Figure 19 to Figure 22 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.

80C31. Figure 19 shows the bus interface for the

80C31, which has an 8-bit multiplexed address/

data bus. The lower address byte is multiplexed

with the data bus. The MCU control signals Pro-

gram Select Enable (PSEN, CNTL2), Read Strobe

(RD, CNTL1), and Write Strobe (WR, CNTL0) may

be used for accessing the internal memory and I/

O Ports blocks. Address Strobe (ALE/AS, PD0)

latches the address.

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

BHE

D7-D0

Even Byte

Odd Byte

PSD834F2V Datasheet(PDF) 39 Page - STMicroelectronics

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