PSD502B1 datasheet(33/153 Pages) STMICROELECTRONICS

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PSD5XX Family

9.2.3 PSD5XX Interface To Non-Multiplexed Bus

Figure 16 shows a PSD5XX interfacing to a microcontroller with a non-multiplexed

address/data bus. The address bus is connected to the ADIO Port, and the data bus is

connected to Port C and/or Port D, depending on the bus width. There is no need for the

ADIO Port to latch the address internally, but the user is offered the option to do so in the

PSD5XX PSDsoft Software. The data ports are in tri-state mode when the PSD5XX is not

accessed by the microcontroller.

Bus

Interface

(Cont.)

9.2.4 Data Byte Enable

Microcontrollers have different data byte orientations with regard to the data bus. The

following tables show how the PSD5XX handles the byte enable under different bus

configurations. Even byte refers to locations with address A0 equal to “0”, and odd byte as

locations with A0 equal to “1”.

BHE

D7 – D0

Even Byte

Odd Byte

Table 6. 8-Bit Data Bus

Table 7. 16-Bit Data Bus With BHE

BHE

D15 – D8

D7 – D0

Odd byte

Even byte

Odd byte

–

Even byte

WRH

WRL

D15 – D8

D7 – D0

Odd byte

Even byte

Odd byte

–

Even byte

Table 8. 16-Bit Data Bus With WRH and WRL

SIZ0

D15 – D8

D7 – D0

Even byte

Odd byte

Even byte

–

Odd byte

Table 9. 16-Bit Data Bus With SIZ0, A0

LDS

UDS (A0)

D15 – D8

D7 – D0

Even byte

Odd byte

Even byte

–

Odd byte

Table 10. 16-Bit Data Bus With UDS, LDS

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