P80C32 datasheet(53/62 Pages) PHILIPS

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Philips Semiconductors

Product data

P80C3xX2; P80C5xX2;

P87C5xX2

80C51 8-bit microcontroller family

4K/8K/16K/32K ROM/OTP, 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 11) 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 (87C51), or 32 bytes (87C52/4) of encryption array are

initially unprogrammed (all 1s).

Table 11. 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.

80C51X2 ROM CODE SUBMISSION

When submitting a ROM code for the 80C51X2, the following must be specified:

1. 4 kbyte user ROM data

2. 64 byte ROM encryption key

3. ROM security bits.

ADDRESS

CONTENT

BIT(S)

COMMENT

0000H to 0FFFH

DATA

7:0

User ROM Data

1000H to 103FH

KEY

7:0

ROM Encryption Key

1040H

SEC

ROM Security Bit 1

1040H

SEC

ROM Security Bit 2

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.

80C52X2 ROM CODE SUBMISSION

When submitting a ROM code for the 80C52X2, the following must be specified:

1. 8 kbyte user ROM data

2. 64 byte ROM encryption key

3. ROM security bits.

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