P87LPC761BN NXP Semiconductors, P87LPC761BN Datasheet - Page 49

• Manufacturer Part Number: P87LPC761BN
• Description: IC, MCU 8BIT 80C51 2K OTP, DIP16
• Manufacturer: NXP Semiconductors

Specifications of P87LPC761BN

• Controller Family/series: (8051) 8052
• Core Size: 8bit
• No. Of I/o's: 14
• Program Memory Size: 2KB
• Ram Memory Size: 128Byte
• Cpu Speed: 20MHz
• Oscillator Type: External, Internal
• No. Of Timers: 2
• Digital: RoHS Compliant
• Package: 16PDIP
• Device Core: 80C51
• Family Name: 87LP
• Maximum Speed: 20 MHz
• Ram Size: 128 Byte
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• Number Of Programmable I/os: 14
• Interface Type: I2C/UART
• Operating Temperature: 0 to 70 °C
• Number Of Timers: 2

Philips Semiconductors
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
2002 Mar 07
Low power, low price, low pin count (16 pin)
microcontroller with 2 kbyte OTP
UCFG2
SB2
1
1
0
0
BIT
UCFG2.7, 6
UCFG2.5–0
Address: FD01h
SB1
1
0
1
0
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.
SYMBOL
SB2, SB1
SB2
—
7
FUNCTION
EPROM security bits. See table entitled, “EPROM Security Bits” for details.
Reserved for future use.
Figure 40. EPROM System Configuration Byte 2 (UCFG2)
SB1
6
—
5
—
4
46
Protection Description
—
3
—
2
—
1
—
0
Unprogrammed Value: FFh
P87LPC761
Preliminary data
SU01186