83C51FC datasheet(16/20 Pages) INTEL

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8XC51FX

PROGRAMMING THE EPROMOTP

To be programmed the part must be running with a

4 to 6 MHz oscillator (The reason the oscillator

needs to be running is that the internal bus is being

used to transfer address and program data to appro-

priate internal EPROM locations) The address of an

EPROM location to be programmed is applied to

Port 1 and pins P20 - P24 of Port 2 while the code

byte to be programmed into that location is applied

to Port 0 The other Port 2 and 3 pins RST PSEN

and EA VPP should be held at the ‘‘Program’’ levels

indicated in Table 4 ALEPROG is pulsed low to

program the code byte into the addressed EPROM

location The setup is shown in Figure 10

Normally EA VPP is held at logic high until just be-

fore ALEPROG is to be pulsed Then EA VPP is

raised to VPP ALEPROG is pulsed low and then

EA VPP is returned to a valid high voltage The volt-

age on the EA VPP pin must be at the valid EA VPP

high level before a verify is attempted Waveforms

and detailed timing specifications are shown in later

sections of this data sheet

NOTE

EA VPP pin must not be allowed to go above the

maximum specified VPP level for any amount of

time Even a narrow glitch above that voltage lev-

el can cause permanent damage to the device

The VPP source should be well regulated and free

of glitches

Table 4 EPROM Programming Modes

Mode

RST

PSEN

ALE

P26

P27

P33

P36

P37

PROG

VPP

Program Code Data

1275V

Verify Code Data

Program Encryption

1275V

Array Address 0 – 3FH

Program Lock

Bit 1

1275V

Bits

Bit 2

1275V

Bit 3

1275V

Read Signature Byte

272322 – 20

See Table 4 for proper input on these pins

Figure 10 Programming the EPROM

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