AT89C51-20JC View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT89C51-20JC

8-Bit Microcontroller with 4K Bytes Flash

Atmel Corporation 

AT89C51

Figure 3. Programming the Flash

A0 - A7

ADDR.

OOOOH/OFFFH

A8 - A11

AT89C51

P1

VCC

P2.0 - P2.3 P0

P2.6

SEE FLASH

PROGRAMMING

MODES TABLE

P2.7

ALE

P3.6

P3.7

XTAL2

EA

+5V

PGM

DATA

PROG

VIH/VPP

3-24 MHz

Figure 4. Verifying the Flash

A0 - A7

ADDR.

OOOOH/0FFFH

A8 - A11

AT89C51

P1

VCC

P2.0 - P2.3 P0

P2.6

SEE FLASH

PROGRAMMING

MODES TABLE

P2.7

ALE

P3.6

P3.7

XTAL2

EA

+5V

PGM DATA

(USE 10K

PULLUPS)

VIH

3-24 MHz

XTAL1

RST

VIH

GND

PSEN

XTAL1

RST

VIH

GND

PSEN

Flash Programming and Verification Characteristics

TA = 0°C to 70°C, VCC = 5.0 ± 10%

Symbol

Parameter

Min

VPP(1)

IPP(1)

Programming Enable Voltage

Programming Enable Current

11.5

1/tCLCL

Oscillator Frequency

3

tAVGL

Address Setup to PROG Low

48tCLCL

tGHAX

Address Hold After PROG

48tCLCL

tDVGL

Data Setup to PROG Low

48tCLCL

tGHDX

Data Hold After PROG

48tCLCL

tEHSH

P2.7 (ENABLE) High to VPP

48tCLCL

tSHGL

VPP Setup to PROG Low

10

tGHSL(1)

VPP Hold After PROG

10

tGLGH

PROG Width

1

tAVQV

Address to Data Valid

tELQV

ENABLE Low to Data Valid

tEHQZ

Data Float After ENABLE

0

tGHBL

PROG High to BUSY Low

tWC

Byte Write Cycle Time

Note: 1. Only used in 12-volt programming mode.

Max

Units

12.5

V

1.0

mA

24

MHz

110

48tCLCL

48tCLCL

48tCLCL

1.0

2.0

µs

µs

µs

µs

ms

4-35

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