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
61
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 0 ROM Security Bit 1
0 = enable security
1 = disable security
8040H SEC 1 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.
