P87C511 datasheet(17/21 Pages) INTEL

17 / 21 page

87C5180C51BH80C31BH

PROGRAMMING THE 87C51

The part must be running with a 4 MHz to 6 MHz

oscillator The address of an EPROM location to be

programmed is applied to address lines while the

code byte to be programmed in that location is ap-

plied to data lines Control and program signals must

be held at the levels indicated in Table 4 Normally

EA VPP is held at logic high until just before

ALEPROG is to be pulsed The EA VPP is raised to

VPP ALEPROG is pulsed low and then EA VPP is

returned to a high (also refer to timing diagrams)

NOTE

Exceeding the VPP maximum for any amount of

time could damage the device permanently The

VPP source must be well regulated and free of

glitches

DEFINITION OF TERMS

ADDRESS LINES

P10 – P17 P20 – P25 P34 re-

spectively for A0 – A14

DATA LINES

P00 – P07 for D0 – D7

CONTROL SIGNALS

RST PSEN P26 P27 P33

P36 P37

PROGRAM SIGNALS

ALEPROG EA VPP

Table 4 EPROM Programming Modes

Mode

RST

PSEN

ALE

P26

P27

P33

P36

P37

PROG

VPP

Program Code Data

1275V

HHHH

Verify Code Data

Program Encryption

1275V

Array Address 0 – 3F

Program Lock Bits

Bit 1

1275V

HHHHH

Bit 2

1275V

Bit 3

1275V

Read Signature Byte

LLLLL

272335 – 21

See Table 4 for proper input on these pins

Figure 10 Programming the EPROM

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