P87LPC761 datasheet(49/58 Pages) PHILIPS

49 / 58 page

Philips Semiconductors

Preliminary data

P87LPC761

Low power, low price, low pin count (16 pin)

microcontroller with 2 kbyte OTP

2002 Mar 07

BIT

SYMBOL

FUNCTION

UCFG2.7, 6

SB2, SB1

EPROM security bits. See table entitled, “EPROM Security Bits” for details.

UCFG2.5–0

—

Reserved for future use.

—

SU01186

—

SB1

SB2

UCFG2

Unprogrammed Value: FFh

Address: FD01h

Figure 40. EPROM System Configuration Byte 2 (UCFG2)

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

Both security bits unprogrammed. No program security features enabled. EPROM is programmable and verifiable.

Only security bit 1 programmed. Further EPROM programming is disabled. Security bit 2 may still be programmed.

Only security bit 2 programmed. This combination is not supported.

Both security bits programmed. All EPROM verification and programming are disabled.

P87LPC761 Datasheet(PDF) 49 Page - NXP Semiconductors