CP82C54 - Renesas Electronics

CP82C54 Frequently Asked Questions (FAQs)

• What is the maximum frequency of the clock input?
  The maximum frequency of the clock input is 10 MHz, but it can be as high as 12 MHz with a 5V power supply and a duty cycle of 50%.
• How do I reset the timer?
  The timer can be reset by setting the RESET pin high for at least 2 clock cycles. This will reset the counters and the control registers.
• What is the purpose of the GATE input?
  The GATE input is used to enable or disable the counting of the timer. When GATE is low, the timer is disabled and the counters do not increment. When GATE is high, the timer is enabled and the counters increment based on the clock input.
• How do I use the timer in mode 0 (interrupt on terminal count)?
  In mode 0, the timer generates an interrupt when the counter reaches zero. To use this mode, set the mode control register to 0, load the counter with the desired value, and enable the timer. When the counter reaches zero, an interrupt will be generated.
• What is the difference between the OUT pin and the OUT_LINE pin?
  The OUT pin is an active low output that goes low when the counter reaches zero. The OUT_LINE pin is an active high output that goes high when the counter reaches zero. The OUT_LINE pin is used in mode 2 (rate generator) and mode 3 (square wave generator).