PSD413A1 datasheet(40/123 Pages) STMICROELECTRONICS

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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

PSD4XX Family

Table 5. Typical Microcontroller Bus Types

9.2 Bus Interface

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

microcontrollers with no glue logic. Table 5 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 PSD4XX is able to

interface to most microcontrollers, including the ones listed in Table 5. In Table 6, 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 PSD4XX and some typical

microcontrollers are shown in following sections.

The PSD4XX

Architecture

(cont.)

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