80C31 datasheet(30/38 Pages) PHILIPS

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Philips Semiconductors

Product specification

80C51/87C51/80C31

80C51 8-bit microcontroller family

4K/128 OTP/ROM/ROMless, low voltage (2.7V–5.5V),

low power, high speed (33 MHz)

2000 Jan 20

Table 8. EPROM Programming Modes

MODE

RST

PSEN

ALE/PROG

EA/VPP

P2.7

P2.6

P3.7

P3.6

Read signature

Program code data

VPP

Verify code data

Pgm encryption table

VPP

Pgm security bit 1

VPP

Pgm security bit 2

VPP

Pgm security bit 3

VPP

NOTES:

1. ‘0’ = Valid low for that pin, ‘1’ = valid high for that pin.

2. VPP = 12.75V ±0.25V.

3. VCC = 5V±10% during programming and verification.

ALE/PROG receives 5 programming pulses for code data (also for user array; 5 pulses for encryption or security bits) while VPP is held at

12.75V. Each programming pulse is low for 100

µs (±10µs) and high for a minimum of 10µs.

Table 9. Program Security Bits for EPROM Devices

PROGRAM LOCK BITS1, 2

SB1

SB2

SB3

PROTECTION DESCRIPTION

No Program Security features enabled. (Code verify will still be encrypted by the Encryption Array if

programmed.)

MOVC instructions executed from external program memory are disabled from fetching code bytes

from internal memory, EA is sampled and latched on Reset, and further programming of the EPROM

is disabled.

Same as 2, also verify is disabled.

Same as 3, external execution is disabled. Internal data RAM is not accessible.

NOTES:

1. P – programmed. U – unprogrammed.

2. Any other combination of the security bits is not defined.

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