PSD913F2 datasheet(39/94 Pages) STMICROELECTRONICS

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Preliminary Information

PSD9XX Family

The

PSD9XX

Functional

Blocks

(cont.)

9.3 Microcontroller Bus Interface

The “no-glue logic” PSD9XX Microcontroller Bus Interface can be directly connected to

most popular microcontrollers and their control signals. Key 8-bit microcontrollers with their

bus types and control signals are shown in Table 17. The interface type is specified using

the PSDsoft.

Data

Bus

MCU

Width

CNTL0

CNTL1

CNTL2

PC7

PD0**

ADIO0

PA3-PA0 PA7-PA4

8031/8051

PSEN

ALE

80C51XA

PSEN

ALE

A3-A0

80C251

PSEN

ALE

80C251

PSEN

ALE

80198

ALE

68HC11

R/W

68HC05C0

68HC912

R/W

DBE

Z80

D3-D0

D7-D4

R/W

68330

R/W

M37702M2

R/W

ALE

D3-D0

D7-D4

Table 17. Microcontrollers and their Control Signals

**Unused CNTL2 pin can be configured as PLD input. Other unused pins (PC7, PD0, PA3-0) can be

**configured for other I/O functions.

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

9.3.1. PSD9XX Interface to a Multiplexed 8-Bit Bus

Figure 12 shows an example of a system using a microcontroller with an 8-bit multiplexed

bus and a PSD9XX. The ADIO port on the PSD9XX is connected directly to the

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

addresses can be brought out to Port A or B. The PSD9XX 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 D may be used as additional

address inputs.

9.3.2. PSD9XX Interface to a Non-Multiplexed 8-Bit Bus

Figure 13 shows an example of a system using a microcontroller with an 8-bit

non-multiplexed bus and a PSD9XX. The address bus is connected to the ADIO Port, and

the data bus is connected to Port A. Port A is in tri-state mode when the PSD9XX is not

accessed by the microcontroller. Should the system address bus exceed sixteen bits, Ports

B, C, or D may be used for additional address inputs.

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