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Z86E0412SSC1924 Datasheet(PDF) 6 Page - Zilog, Inc. |
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Z86E0412SSC1924 Datasheet(HTML) 6 Page - Zilog, Inc. |
6 / 38 page Z86E02/E04/E08/E09 SL1995 Z8 CMOS OTP Microcontrollers PS009201-0301 Programming Specification 1 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: 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 first 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 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 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. Z86E02 SL1995 Z86E04 SL1995 Z86E08 SL1995 Z86E09 SL1995 |
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