S87C751-4A28 datasheet by Philips Semiconductors

S87C751-4A28 Frequently Asked Questions (FAQs)

• What is the recommended oscillator crystal frequency for this microcontroller?
  The recommended oscillator crystal frequency for the S87C751-4A28 is 12 MHz, but it can operate with a frequency range of 4 MHz to 24 MHz.
• How do I configure the watchdog timer (WDT) in this microcontroller?
  The WDT in the S87C751-4A28 can be configured using the WDTC register. You need to set the WDT clock source, timeout period, and enable the WDT by setting the WDTE bit in the WDTC register.
• What is the maximum current that can be sourced or sunk by the I/O pins?
  The maximum current that can be sourced by the I/O pins is 15 mA, and the maximum current that can be sunk is 20 mA. However, it's recommended to limit the current to 10 mA for reliable operation.
• How do I implement a UART communication protocol using the S87C751-4A28?
  The S87C751-4A28 has a built-in UART module. To implement UART communication, you need to configure the UART registers (SCON, SBUF, and AUXR), set the baud rate, and use the UART interrupt to transmit and receive data.
• What is the power consumption of the S87C751-4A28 in idle mode?
  The power consumption of the S87C751-4A28 in idle mode is typically around 10 mA at 5V and 12 MHz frequency. However, this value can vary depending on the specific application and operating conditions.