The maximum clock frequency for the P89LPC952FA is 12 MHz, but it can be overclocked up to 15 MHz with some limitations.
The oscillator can be configured using the OSCCFG register. The oscillator frequency can be set to either 12 MHz or 14.7456 MHz, and the oscillator mode can be set to either XTAL or RC.
The watchdog timer is used to reset the microcontroller if it becomes stuck in an infinite loop or if it fails to respond within a certain time period. This is useful for ensuring system reliability and preventing system crashes.
The UART can be used for serial communication with other devices. The UART is configured using the UCFG register, and data is transmitted and received using the UART transmitter and receiver registers.
The maximum current that can be sourced or sunk by the I/O pins of the P89LPC952FA is 20 mA per pin, with a total current limit of 100 mA for all I/O pins combined.
P89LPC952FA datasheet
by NXP Semiconductors
