P87C51RB2BBD datasheet(61/67 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

ROM CODE SUBMISSION FOR 32K ROM DEVICES (87C51RC2)

When submitting ROM code for the 32K ROM devices, the following must be specified:

1. 32 kbyte user ROM data

2. 64 byte ROM encryption key

3. ROM security bits.

ADDRESS

CONTENT

BIT(S)

COMMENT

0000H to 7FFFH

DATA

7:0

User ROM Data

8000H to 803FH

KEY

7:0

ROM Encryption Key

FFH = no encryption

8040H

SEC

ROM Security Bit 1

0 = enable security

1 = disable security

8040H

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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