Z86E09 Datasheet, PDF(6/38 Page) Zilog, Inc. – Z8 CMOS OTP Microcontrollers

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Z86E09 Datasheet, PDF (6/38 Pages) Zilog, Inc. – Z8 CMOS OTP Microcontrollers

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Z86E02/E04/E08/E09 SL1995

Z8 CMOS OTP Microcontrollers

General Description

The EPROM Programming interface is a byte-wide data interface with 7 control

inputs and a 17-wire connection. This document describes the EPROM interface

pertinent to the following parts:

Z86E02 SL1995

Z86E04 SL1995

Z86E08 SL1995

Z86E09 SL1995

Top-Level Programming

After powering up, the programming sequence begins by sending the unlock code

sequence, followed by the mode selection. The program address must be reset to

0000h after entering EPROM mode. The ï¬rst data byte to be programmed is then

loaded on Port 2. When the programming control sequence is applied, the pro-

gramming pulse commences. Data is then veriï¬ed for correct programming. If the

data is incorrect, a count begins to record the number of programming pulse

cycles before success is ï¬nally achieved. If the data is not programmed after

NMAX attempts, it is a failed part. If data is veriï¬ed, then it must be overpro-

grammed for a minimum of 3 times the cumulative programming time. The

address counter is then incremented to the next address. The next data byte is

sent, and programming continues using the same basic algorithm. See Figure 1.

PS009201-0301

Programming Specification

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