80C554 datasheet(73/76 Pages) PHILIPS

73 / 76 page

Philips Semiconductors

Preliminary specification

80C554/83C554/87C554

80C51 8-bit microcontroller – 6 clock operation

16K/512 OTP/ROM/ROMless, 7 channel 10 bit A/D, I2C, PWM,

capture/compare, high I/O, 64L LQFP

2000 Nov 10

EPROM CHARACTERISTICS

The 87C554 contains three signature bytes that can be read and

used by an EPROM programming system to identify the device. The

signature bytes identify the device as an 87C554 manufactured by

Philips:

(030H) = 15H indicates manufactured by Philips Components

(031H) = 93H indicates 87C554

(60H) =

01H

Program Verification

If security bits 2 or 3 have not been programmed, the on-chip

program memory can be read out for program verification.

Security Bits

With none of the security bits programmed the code in the program

memory can be verified. When only security bit 1 (see Table 12) is

programmed, MOVC instructions executed from external program

memory are disabled from fetching code bytes from the internal

memory, EA is latched on Reset and all further programming of the

EPROM is disabled. When security bits 1 and 2 are programmed, in

addition to the above, verify mode is disabled.

When all three security bits are programmed, all of the conditions

above apply and all external program memory execution is disabled.

Table 12. 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.

NOTES:

1. P – programmed. U – unprogrammed.

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

80C554 Datasheet(PDF) 73 Page - NXP Semiconductors

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