P89C51RB2HBA NXP Semiconductors, P89C51RB2HBA Datasheet - Page 51

• Manufacturer Part Number: P89C51RB2HBA
• Manufacturer: NXP Semiconductors

Specifications of P89C51RB2HBA

• Cpu Family: 89C
• Device Core: 80C51
• Device Core Size: 8b
• Frequency (max): 33MHz
• Interface Type: UART
• Program Memory Type: Flash
• Program Memory Size: 16KB
• Total Internal Ram Size: 512Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 44
• Package Type: PLCC
• Lead Free Status / Rohs Status: Not Compliant

1. Security bits are independent of each other. Full-chip erase may be performed regardless of the state of the security bits.
2. Any other combination of lock bits is undefined.
3. Setting LBx doesn’t prevent programming of unprogrammed bits.
Philips Semiconductors
Security
The security feature protects against software piracy and prevents the contents of the Flash from being read. The Security Lock bits are located
in Flash. The P89C51RB2/RC2/RD2Hxx has three programmable security lock bits that will provide different levels of protection for the on-chip
code and data (see Table 9).
Table 9.
NOTES:
2002 May 24
LEVEL
80C51 8-bit Flash microcontroller family
16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM
1
2
3
4
LB1
0
1
1
1
SECURITY LOCK BITS
LB2
0
0
1
1
LB3
1
0
0
0
1
MOVC instructions executed from external program memory are disabled from fetching code
bytes from internal memory.
Block erase is disabled. Erase or programming of the status byte or boot vector is disabled.
Verify of code memory is disabled.
External execution is disabled.
48
PROTECTION DESCRIPTION
PROTECTION DESCRIPTION
P89C51RB2/P89C51RC2/
P89C51RD2Hxx
Product data