IS89C51 Datasheet, PDF (40/48 Pages) Integrated Silicon Solution, Inc – CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 4-Kbytes of FLASH

IS89C51
ISSI ^®
P2.3-P2.0
P1.7-P1.0
tAVGL
ADDRESS
tGHAX
P0.7-P0.0
tDVGL
EA/VPP
tSHGL
ALE/PROG
tEHSH
DATAIN
tGHDX
VPPH
tGHSL
25 PULSE⁽¹⁾
tGLGH
tGHGL
P2.6, P2.7 _DON'T
P3.6, P3.7 ^CARE
PROGRAMMING COND.
ADDRESS
tAVQV
DATAOUT
VPPL
tELQV
VERIFY COND.⁽²⁾
0V
tELQZ
DON'T
CARE
Figure 26. Flash Memory Programming and Verification Timing Waveform
Notes:
1. One pulse for the main code array, 25 pulses for the encryption array and lock bits.
2. This verify condition is using at main code verification.
3. Power off waveform not shown.
Vcc
P2.3-P2.0
P1.7-P1.0
tPLPH
tELPL
P0.7-P0.0
EA/VPP
ALE/PROG
P2.6, P2.7
P3.6, P3.7
VPPH
tSHGL
tGHSL
tGLGHE
tEHSH
DON'T
CARE
ERASE COND.
0V
0V
ADDRESS
tAVQV
0V
DATAOUT
tPHEH
VPPL
0V
0V
0V
tELQV
tEHVH
0V
VERIFY COND.
tEHQZ
DON'T
CARE
Figure 27. Flash Memory Erase Timing Waveform
Note:
1. The power off and power on waveform can be used in programming or erasing.
40
1-800-379-4774 — Integrated Silicon Solution, Inc.
MC016-1C
11/21/98