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CHAPTER 13 PWC TIMER
13.1 Overview of PWC Timer
13.1
Overview of PWC Timer
The PWC timer is the multi-functional 16-bit up count timer that has the function to
measure the pulse width of input signal.
PWC: Pulse Width Count (pulse width measurement)
■ Function of PWC Timer
Following functions are implemented by hardware of a single channel including a 16-bit up count timer, a
register to control input pulse divider and division ratio, a measurement input pin, and a 16-bit control
register:
●
Timer Functions
• The set interval interrupt request can be generated.
• Standard internal clock can be selected from three types.
●
Pulse width measurement function
• The time interval between arbiter events of external pulse input is measured.
• Standard internal clock can be selected from three types.
• Each kind of measurement mode
- "H" pulse width(↑ - ↓)/"L" pulse width(↓ - ↑)
- Rising cycle(↑ - ↑)/falling cycle(↓ - ↓)
- Measurement between edges(↑ or ↓ to ↓ or ↑)
• The 8-bit input divider enables the division measurement by dividing the input pulses with a
denominator of 2 × 2
• You can make an interrupt occur at the end of measurement.
• You can select either a single measurement or continuous measurements.
290
n
(n = 1, 2, 3, or 4).
FUJITSU MICROELECTRONICS LIMITED
MB90335 Series
CM44-10137-6E
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