PSD954F3V70MIT 데이터 시트보기 (PDF) - STMicroelectronics

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PSD954F3V70MIT

Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 5V

STMicroelectronics 

PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2

PSD Interface to a Multiplexed 8-Bit Bus

Figure 19 shows an example of a system using a

MCU with an 8-bit multiplexed bus and a PSD. The

ADIO port on the PSD is connected directly to the

MCU address/data bus. Address Strobe (ALE/AS,

PD0) latches the address signals internally.

Latched addresses can be brought out to Port A or

B. The PSD drives the ADIO data bus only when

one of its internal resources is accessed and Read

Strobe (RD, CNTL1) is active. Should the system

address bus exceed sixteen bits, Ports A, B, C, or

D may be used as additional address inputs.

Figure 19. An Example of a Typical 8-bit Multiplexed Bus Interface

MCU

WR

RD

BHE

ALE

RESET

AD[ 7:0]

A[ 15:8]

PSD

ADIO

PORT

WR (CNTRL0)

RD (CNTRL1)

BHE (CNTRL2)

RST

PORT

A

PORT

B

PORT

C

ALE (PD0)

PORT D

A[7: 0]

(OPTIONAL)

A[15: 8]

(OPTIONAL)

AI02878C

44/110

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