P87C51RB2BBD datasheet(59/67 Pages) PHILIPS

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Philips Semiconductors

Product data

P87C51RA2/RB2/RC2/RD2

80C51 8-bit microcontroller family 8KB/16KB/32KB/64KB OTP

with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high

speed (30/33 MHz)

2003 Jan 24

MASK ROM DEVICES

Security Bits

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

memory can be verified. If the encryption table is programmed, the

code will be encrypted when verified. When only security bit 1 (see

Table 10) 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.

Encryption Array

64 bytes of encryption array are initially unprogrammed (all 1s).

Table 10.

Program Security Bits

PROGRAM LOCK BITS1, 2

SB1

SB2

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.

NOTES:

1. P – programmed. U – unprogrammed.

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

ROM CODE SUBMISSION FOR 8K ROM DEVICES (87C51RA2)

When submitting ROM code for the 8k ROM devices, the following must be specified:

1. 8 kbyte user ROM data

2. 64 byte ROM encryption key

3. ROM security bits.

ADDRESS

CONTENT

BIT(S)

COMMENT

0000H to 1FFFH

DATA

7:0

User ROM Data

2000H to 203FH

KEY

7:0

ROM Encryption Key

FFH = no encryption

2040H

SEC

ROM Security Bit 1

0 = enable security

1 = disable security

2040H

SEC

ROM Security Bit 2

0 = enable security

1 = disable security

Security Bit 1:

When programmed, this bit has two effects on masked ROM parts:

1. External MOVC is disabled, and

2. EA is latched on Reset.

Security Bit 2:

When programmed, this bit inhibits Verify User ROM.

NOTE: Security Bit 2 cannot be enabled unless Security Bit 1 is enabled.

If the ROM Code file does not include the options, the following information must be included with the ROM code.

For each of the following, check the appropriate box, and send to Philips along with the code:

Security Bit #1:

V Enabled

V Disabled

Security Bit #2:

V Enabled

V Disabled

Encryption:

V No

V Yes

If Yes, must send key file.

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