PSD511B1 datasheet(32/153 Pages) STMICROELECTRONICS

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PSD5XX Family

9.2

Bus

Interface

The Bus Interface is very flexible and can be configured to interface to most

microcontrollers with no glue logic. Table 4 lists some of the bus types to which the Bus

Interface is able to interface.

9.2.1 Bus Interface Configuration

The Bus Interface Logic is user configurable. The type of bus interface is specified by

the user in the PSDsoft software (PSD configuration). The bus control input pins have

multi-function capabilities. By choosing the right configuration, the PSD5XX is able to

interface to most microcontrollers, including the ones listed in Table 4. In Table 5, the

names of the bus control input signal pins and their multiple functions are shown. For

example, Pin PE0 can be configured by the PSD configuration software to perform any one

of the five functions. Examples on the interface between the PSD5XX and some typical

microcontrollers are shown in following sections.

Pin Name

Function

LDS

R/W

WRL

PE0

BHE

PSEN

WRH

UDS

SIZ0

PE1

ALE

AD0

BLE

Table 5. Alternate Pin Functions

9.2.2 PSD5XX Interface To a Multiplexed Bus

Figure 14 shows a typical connection to a microcontroller with a multiplexed bus. The ADIO

port of the PSD5XX is connected directly to the microcontroller address/data bus

(AD0-AD15 for 16 bit bus). The ALE input signal latches the address lines internally. In a

read bus cycle, data is driven out through the ADIO Port transceivers after the specified

access time. The internal ADIO Port connection for a 16 bit multiplexed bus is shown in

Figure 15. The ADIO port is in tri-state mode if none of the PSD5XX internal devices are

selected.

Multiplexed

Data Bus

Bus Control

Microcontroller

Width

Signals

Mux

WR, RD, PSEN, A0

8031/80C51

Mux/Non-mux

8/16

R/W, E, BHE, A0

68HC11

Mux

8/16

WR, RD, BHE, A0

80C196/80C186

Mux

WRL, RD, WRH, A0

80C196SP

Non-mux

R/W, LDS, UDS

68302

Non-mux

8/16

R/W, DS, SIZ0, A0

68340

Non-mux

R/W, DS, BHE, BLE

68330, 68331

Non-mux

RD, WR

68HC05C

Non-mux

R/W, E, LSTRB, A0

68HC12

Non-mux

R/W, DS

68HC16

Table 4. Typical Microcontroller Bus Types

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