The P87C51X2BBD,157 is a 8-bit Microcontroller based on high-performance static 80C51 designs incorporating high-density CMOS technology. The device support both 6-clock and 12-clock operation. The device contain 128 byte 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 devices are low power static designs which offer a wide range of operating frequencies down to zero. Two software selectable modes of power reduction idle mode and power-down mode. 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
- 12 Clock operation with selectable 6-clock operation
- Memory addressing capability - Up to 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
- Three 16-bit timers/counters T0, T1 (standard 80C51) and additional T2 (capture and compare)
- Programmable clock-out pin
- Asynchronous port reset
- Low EMI (inhibit ALE, slew rate controlled outputs and 6-clock mode)
- Wake-up from Power Down by an external interrupt
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