LC86P5420 Datasheet, PDF (4/22 Pages) Sanyo Semicon Device – 8-Bit Single Chip Microcontroller with the One-Time Programmable PROM

LC86P5420
(3) How to use the data security function
"Data security" is the disabled function to read the data of the EPROM.
The following is the process in order to execute the data security.
1. Set 'ON' the jumper of attachment.
2. Program again. Then the EPROM programmer displays the error. The error means normally
activity of the data security. It is not a trouble of the EPROM programmer or the LSI.
Notes
• Data security is not executed when the data of all address have 'FFH' at the sequence 2 above.
• The programming by a sequential operation "BLANK=>PROGRAM=>VERIFY" cannot be executed
data security at the sequence 2 above.
• Set 'OFF' to the jumper after executing the data security.
Data security
Data security
Not data security
Not data security
W86EP5420D
W86EP5420Q
No.6730-4/22