26
1919C–MICRO–3/05
AT89S52
Figure 23-2. Flash Memory Serial Downloading
24. Flash Programming and Verification Waveforms – Serial Mode
Figure 24-1. Serial Programming Waveforms
P1.7/SCK
DATA OUTPUT
INSTRUCTION
INPUT
CLOCK IN
3-33 MHz
P1.5/MOSI
V
IH
XTAL2
RSTXTAL1
GND
V
CC
AT89S52
P1.6/MISO
V
CC
7654 32 10
