The maximum operating temperature range for the P89LPC952FA,512 is -40°C to +85°C.
The oscillator can be configured using the OSCCFG register. The oscillator frequency can be set to 3.072 MHz, 3.2768 MHz, or 3.579545 MHz. The oscillator type can be set to internal, external, or crystal.
The maximum current consumption of the P89LPC952FA,512 is 12 mA at 3.3V and 25°C.
The UART on the P89LPC952FA,512 can be used by configuring the UART registers (UART0, UART1, etc.) and enabling the UART clock. The UART can be used in asynchronous mode or synchronous mode.
The watchdog timer on the P89LPC952FA,512 is used to reset the microcontroller if it becomes stuck in an infinite loop or if the software fails to reset the watchdog timer within a certain time period.