PSD4235G2 datasheet(39/93 Pages) STMICROELECTRONICS

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MCU

CNTL0

CNTL1

CNTL2

PD3

PD0**

ADIO0

PF3-PF0

68302, 68306

R/W

LDS

UDS

–

MMC2001

68330, 68331

R/W

SIZ0

68332, 68340

68LC302,

WEL

WEH

–

MMC2001

68HC16

R/W

SIZ0

68HC912

R/W

LSTRB

DBE

68HC812***

R/W

LSTRB

80196

BHE

ALE

80196SP

WRL

WRH

ALE

80186

BHE

ALE

80C161

80C164-80C167

BHE

ALE

80C51XA

WRL

PSEN

WRH

ALE

A4/D0

A3-A1

H8/3044

WRL

WRH

–

M37702M2

R/W

BHE

ALE

PSD4000 Series

Preliminary Information

The

PSD4000

Functional

Blocks

(cont.)

9.3 Microcontroller Bus Interface

The “no-glue logic” PSD4000 Microcontroller Bus Interface can be directly connected to

most popular microcontrollers and their control signals. Key 16-bit microcontrollers with

their bus types and control signals are shown in Table 14. The MCU interface type is

specified using the PSDsoft.

Table 14. Microcontrollers and their Control Signals

***Unused CNTL2 pin can be configured as GPLD input. Other unused pins (PD3-0, PF3-0) can be

***configured for other I/O functions.

***ALE/AS input is optional for microcontrollers with a non-multiplexed bus.

***This configuration is for 68C812A4_EC at 5MHz, 3V only.

9.3.1. PSD4000 Interface to a Multiplexed Bus

Figure 16 shows an example of a system using a microcontroller with a 16-bit multiplexed

bus and a PSD4000. The ADIO port on the PSD4000 is connected directly to the

microcontroller address/data bus. ALE latches the address lines internally. Latched

addresses can be brought out to Port E, F or G. The PSD4000 drives the ADIO data bus

only when one of its internal resources is accessed and the RD input is active. Should the

system address bus exceed sixteen bits, Ports A, B, C, or F may be used as additional

address inputs.

9.3.2. PSD4000 Interface to a Non-Multiplexed Bus

Figure 17 shows an example of a system using a microcontroller with a 16-bit

non-multiplexed bus and a PSD4000. The address bus is connected to the ADIO Port, and

the data bus is connected to Port F and G. Port F and G are in tri-state mode when the

PSD4000 is not accessed by the microcontroller. Should the system address bus exceed

sixteen bits, Ports A, B or C may be used for additional address inputs.

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