PSD813F1 datasheet(48/120 Pages) STMICROELECTRONICS

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PSD813F1-A

Preliminary

The

PSD813F1

Functional

Blocks

(cont.)

9.3 Microcontroller Bus Interface

The “no-glue logic” PSD813F1 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 Configuration.

Data

Bus

MCU

Width

CNTL0

CNTL1

CNTL2

PC7

PD0**

ADIO0

PA3-PA0 PA7-PA3

8031

PSEN

ALE

80C51XA

PSEN

ALE

A3-A0

80C251

PSEN

ALE

80C251

PSEN

ALE

80198

ALE

68HC11

R/W

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 CPLD 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. PSD813F1 Interface to a Multiplexed 8-Bit Bus

Figure 17 shows an example of a system using a microcontroller with an 8-bit multiplexed

bus and a PSD813F1. The ADIO port on the PSD813F1 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 PSD813F1 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. PSD813F1 Interface to a Non-Multiplexed 8-Bit Bus

Figure 18 shows an example of a system using a microcontroller with an 8-bit

non-multiplexed bus and a PSD813F1. 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 PSD813F1 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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