Z86E0412PSC1860 ZILOG [Zilog, Inc.], Z86E0412PSC1860 Datasheet - Page 6

• Manufacturer Part Number: Z86E0412PSC1860
• Description: Z8 CMOS OTP Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

General Description
PS009201-0301
Top-Level Programming
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:
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
N
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
MAX
attempts, it is a failed part. If data is verified, then it must be overpro-
P r o g r a m m i n g S p e c i f i c a t i o n
Z8 CMOS OTP Microcontrollers
Z86E02/E04/E08/E09 SL1995
1