Quick Detail:
Z8 CMOS OTP Microcontrollers


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


Applications:

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 first data byte to be programmed is then loaded on Port 2. When the programming control sequence is applied, the programming pulse commences. Data is then verified for correct programming. If the data is incorrect, a count begins to record the number of programming pulse cycles before success is finally achieved. If the data is not programmed after NMAX attempts, it is a failed part. If data is verified, then it must be overprogrammed 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.


Specifications:

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