ZPSD503B1-C-15J View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ZPSD503B1-C-15J

Low Cost Field Programmable Microcontroller Peripherals

STMicroelectronics 

9.2

Bus

Interface

PSD5XX Family

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.

Table 4. Typical Microcontroller Bus Types

Multiplexed

Data Bus

Width

Bus Control

Signals

Mux

Mux /Non-mux

Mux

Mux

Non-mux

Non-mux

Non-mux

Non-mux

Non-mux

Non-mux

8

WR, RD, PSEN, A0

8/16

R/W, E, BHE, A0

8/16

WR, RD, BHE, A0

16

WRL, RD, WRH, A0

16

R/W, LDS, UDS

8/16

R/W, DS, SIZ0, A0

16

R/W, DS, BHE, BLE

8

RD, WR

16

R/W, E, LSTRB, A0

16

R/W, DS

Microcontroller

8031/80C51

68HC11

80C196/80C186

80C196SP

68302

68340

68330, 68331

68HC05C

68HC12

68HC16

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.

Table 5. Alternate Pin Functions

Pin Name

Pin

Function

1

Pin

Function

2

RD

RD

E

WR

WR

R/W

PE0

BHE

PSEN

PE1

ALE

AD0

A0

BLE

Pin

Function

3

DS

WRL

WRH

Pin

Function

4

LDS

UDS

Pin

Function

5

SIZ0

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.

29

Share Link: