LEAPTRONIX WICE-52 MCS-51 On-Board-Debug

Internal RC oscillator: Do not need external oscillator: 6MHz (1T)

Quartz clock: Built-in quartz clock selection: 12/22MHz (1T)

RAM: Internal + Extended SRAM: 256+1K (XRAM)

ROM: Internal / External (byte): 64K/64K

I/O port: 2 way I/O pins: 32, 36 or 40

Interrupts: Peripherals work: 14 interrupts

EXINT: External Interrupt: 4

Timer/Counter: 16-bit counter: 3 sets

WDT: Watchdog timer: Support

UART: Asynchronous serial port: 2 sets

SPI: Serial peripheral interface: Yes

ADC: 10-bit analog to digital: 8 channels

PCA: PWM, catcher included: 6 sets

Datasheet