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AT89S52-24AC

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT89S52

23. Flash Programming and Verification Characteristics (Parallel Mode)

TA = 20°C to 30°C, VCC = 4.5 to 5.5V

Symbol

Parameter

Min

Max

VPP

IPP

ICC

1/tCLCL

tAVGL

tGHAX

tDVGL

tGHDX

tEHSH

tSHGL

tGHSL

tGLGH

tAVQV

tELQV

tEHQZ

tGHBL

tWC

Programming Supply Voltage

Programming Supply Current

VCC Supply Current

Oscillator Frequency

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

Address to Data Valid

ENABLE Low to Data Valid

Data Float After ENABLE

PROG High to BUSY Low

Byte Write Cycle Time

11.5

3

48 tCLCL

48 tCLCL

48 tCLCL

48 tCLCL

48 tCLCL

10

10

0.2

0

12.5

10

30

33

1

48 tCLCL

48 tCLCL

48 tCLCL

1.0

50

Figure 23-1. Flash Programming and Verification Waveforms – Parallel Mode

P1.0 - P1.7

P2.0 - P2.4

PORT 0

ALE/PROG

EA/VPP

PROGRAMMING

ADDRESS

tAVGL

tSHGL

DATA IN

tDVGL tGHDX

VPP

tGLGH

tGHAX

VERIFICATION

ADDRESS

tAVQV

DATA OUT

tGHSL

LOGIC 1

LOGIC 0

P2.7

(ENABLE)

P3.0

(RDY/BSY)

tEHSH

tGHBL

tELQV

BUSY

tWC

READY

tEHQZ

Units

V

mA

mA

MHz

µs

µs

µs

µs

µs

25

1919C–MICRO–3/05

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