P87C660X2 PHILIPS [NXP Semiconductors], P87C660X2 Datasheet - Page 97

• Manufacturer Part Number: P87C660X2
• Description: 80C51 8-bit microcontroller family
• Manufacturer: PHILIPS [NXP Semiconductors]

1. P – programmed. U – unprogrammed.
2. Any other combination of the security bits is not defined.
Philips Semiconductors
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 19) is programmed, MOVC instructions executed from
external program memory are disabled from fetching code bytes
Table 19. Program Security Bits
NOTES:
2003 Oct 02
PROGRAM LOCK BITS
80C51 8-bit microcontroller family
RAM, low voltage (2.7 to 5.5 V), low power, high speed (30/33
MHz), two 400KB I
1
2
SB1
U
P
SB2
2
U
U
C interfaces
1, 2
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.
16 KB OTP/ROM, 512B
97
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).
P8xC660X2/661X2
Product data