P87LPC761 Datasheet, PDF (49/58 Pages) NXP Semiconductors – Low power, low price, low pin count (16 pin) microcontroller with 2 kbyte OTP

Philips Semiconductors
Low power, low price, low pin count (16 pin)
microcontroller with 2 kbyte OTP
Preliminary data
P87LPC761
UCFG2 Address: FD01h
Unprogrammed Value: FFh
7
6
5
4
3
2
1
0
SB2
SB1
—
—
—
—
—
—
BIT
UCFG2.7, 6
UCFG2.5–0
SYMBOL
SB2, SB1
—
FUNCTION
EPROM security bits. See table entitled, “EPROM Security Bits” for details.
Reserved for future use.
Figure 40. EPROM System Configuration Byte 2 (UCFG2)
SU01186
Security Bits
When neither of the security bits are programmed, the code in the EPROM can be verified. When only security bit 1 is programmed, all further
programming of the EPROM is disabled. At that point, only security bit 2 may still be programmed. When both security bits are programmed,
EPROM verify is also disabled.
Table 11. EPROM Security Bits
SB2
SB1
Protection Description
1
1
Both security bits unprogrammed. No program security features enabled. EPROM is programmable and verifiable.
1
0
Only security bit 1 programmed. Further EPROM programming is disabled. Security bit 2 may still be programmed.
0
1
Only security bit 2 programmed. This combination is not supported.
0
0
Both security bits programmed. All EPROM verification and programming are disabled.
2002 Mar 07
46