P87C52SBAA

The P87C52SBAA is a 8-bit Microcontroller based on is a high-performance static 80C51 design fabricated with high-density CMOS technology. The device contain 256 x 8 RAM, 32 I/O lines, three 16-bit counter/timers, a six-source, four-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART and on-chip oscillator and clock circuits. In addition, the device is a low power static design which offers a wide range of operating frequencies down to zero. Two software selectable modes of power reduction idle mode and power-down mode are available. The idle mode freezes the CPU while allowing the RAM, timers, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative.

• 80C51 Central processing unit
• Memory addressing capability 64kB ROM and 64kB RAM
• Clock can be stopped and resumed
• Idle mode
• Power-down mode
• CMOS and TTL compatible
• 2 Speed ranges at VCC = 5V - 0 to 30MHz with 6-clock operation, 0 to 33MHz with 12-clock operation
• Dual data pointers
• Security bits - ROM (2 bits), OTP (3 bits)
• Encryption array - 64 bytes
• Four interrupt priority levels
• Six interrupt sources
• Four 8-bit I/O ports
• Full-duplex enhanced UART
• Programmable clock-out pin
• Asynchronous port reset
• Low EMI (inhibit ALE and slew rate controlled outputs)
• Wake-up from Power Down by an external interrupt