MLC852P Datasheet, PDF (35/35 Pages) Megawin Technology Co., Ltd – single chip 8-bit micro-controller

2.VPP Signal Explanation
The following diagram explains VPP signal.
12 V
5V
0V
T1
T2
T3
Vp-p Signal
The voltage, waveform and timing requirments for VPP to program IC are as followed:
T1: Normal Operation timing.
T2: Reset Timing, and its purpose is to set the Address Counter of
Interanl IC to zero.
T3: Duration time of programming.
Therefore, when program IC completes, VPP should be at GND state to ensure futher operations.
Version History
VERSION DATE
0.2 Jul. 2007
0.3 Aug. 2007
0.4 Aug. 2007
PAGE
DESCRIPTION
Initial issue
P2,28,35 Modify VPP pin pull low circuit
P32 Revised DC Characteristics of LVD
MEGAWIN
MLC852P Technical Summary
35