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CHAPTER 16 PWC Timer
16.1
Overview of the PWC Timer
The PWC timer (pulse-width measurement) is the multi-functional 16-bit up counter with
the reload function and also has a function that calculates the pulse width of the input
signal.
The PWC timer consists of a 16-bit counter, an input pulse divider, a division rate
control register, a count input pin, a pulse output pin, and a 16-bit control register.
■ PWC Timer (× 2, PWC Timer 0 is not present in MB90465 Series)
The MB90460 series contain two PWC timer channels, while MB90465 series contains only PWC timer 1.
The PWC timer has the following characteristics:
●
Timer function
• Generates an interrupt request at the specified time interval.
• Outputs the pulse signal that is synchronized with the timer period.
• Selects the counter clock from three internal clocks.
●
Pulse-width measurement function
• Generates an interrupt request at the specified time interval.
• Outputs the pulse signal that is synchronized with the timer period.
• Selects the counter clock from three internal clocks.
●
Pulse-width measurement function
• Measures the time between external pulse input events.
• Selects the counter clock from three internal clocks.
• Count mode
- H pulse width (rising edge to falling edge) / L pulse width (falling edge to rising edge)
- Rising edge period (rising edge to falling edge) / falling edge period (falling edge to rising edge)
- Intermediate edge count (rising or falling edge to falling or rising edge)
• Uses the 16-bit input divider to divide the input pulse by 2
measurement.
• Generates an interrupt request at completion of count.
• Selects single count or continuous count.
●
PWC timer operation
This block is a multi-functional timer that is based on the 16-bit up-count timer and contains a count input
pin and an 8-bit input divider. The block has two main functions, a timer function and a pulse-with
measurement function, both of which enable the selection of two types of count clocks.
434
2
4
6
8
, 2
, 2
, and 2
to enable period
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