AT89 datasheet(7/15 Pages) ATMEL

7 / 15 page

AT89C51

4-35

Figure 3. Programming the Flash

Figure 4. Verifying the Flash

P2.6

P3.6

P2.0 - P2.3

A0 - A7

ADDR.

OOOOH/OFFFH

SEE FLASH

PROGRAMMING

MODES

ABLE

3-24 MHz

A8 - A11

+5V

P2.7

PGM

DATA

PROG

V/V

ALE

P3.7

XTAL2

RST

PSEN

XTAL1

GND

AT89C51

P2.6

P3.6

P2.0 - P2.3

A0 - A7

ADDR.

OOOOH/0FFFH

3-24 MHz

A8 - A11

+5V

P2.7

PGM DATA

(USE 10K

PULLUPS)

ALE

P3.7

XTAL2

RST

PSEN

XTAL1

GND

AT89C51

SEE FLASH

PROGRAMMING

MODES

ABLE

Flash Programming and Verification Characteristics

TA = 0°C to 70°C, VCC = 5.0 ± 10%

Note:

1. Only used in 12-volt programming mode.

Symbol

Parameter

Min

Max

Units

VPP

(1)

Programming Enable Voltage

11.5

12.5

IPP

(1)

Programming Enable Current

1.0

1/tCLCL

Oscillator Frequency

324

MHz

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

µs

tGHSL

(1)

VPP Hold After PROG

µs

tGLGH

PROG Width

1110

µs

tAVQV

Address to Data Valid

48tCLCL

tELQV

ENABLE Low to Data Valid

48tCLCL

tEHQZ

Data Float After ENABLE

048tCLCL

tGHBL

PROG High to BUSY Low

1.0

µs

tWC

Byte Write Cycle Time

2.0

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