AT89S52
Flash Programming and Verification Characteristics (Parallel Mode)
TA = 20°C to 30°C, VCC = 4.5 to 5.5V
Symbol
VPP
Parameter
Min
Max
12.5
10
Units
V
Programming Supply Voltage
Programming Supply Current
VCC Supply Current
11.5
IPP
mA
mA
MHz
ICC
30
1/tCLCL
tAVGL
tGHAX
tDVGL
tGHDX
tEHSH
tSHGL
tGHSL
tGLGH
tAVQV
tELQV
tEHQZ
tGHBL
tWC
Oscillator Frequency
3
33
Address Setup to PROG Low
Address Hold After PROG
Data Setup to PROG Low
Data Hold After PROG
P2.7 (ENABLE) High to VPP
VPP Setup to PROG Low
VPP Hold After PROG
PROG Width
48tCLCL
48tCLCL
48tCLCL
48tCLCL
48tCLCL
10
µs
µs
µs
10
0.2
1
Address to Data Valid
ENABLE Low to Data Valid
Data Float After ENABLE
PROG High to BUSY Low
Byte Write Cycle Time
48tCLCL
48tCLCL
48tCLCL
1.0
0
µs
µs
50
Figure 15. Flash Programming and Verification Waveforms – Parallel Mode
PROGRAMMING
P1.0 - P1.7
P2.0 - P2.5
VERIFICATION
ADDRESS
ADDRESS
tAVQV
P3.4
PORT 0
DATA IN
DATA OUT
tDVGL tGHDX
tAVGL
tGHAX
ALE/PROG
tSHGL
tGHSL
tGLGH
VPP
LOGIC 1
LOGIC 0
EA/VPP
tEHSH
tEHQZ
tELQV
P2.7
(ENABLE)
tGHBL
P3.0
(RDY/BSY)
BUSY
tWC
READY
19
ATMEL [ ATMEL ]
