Timing Of 16-Bit Free-Run Timer - Fujitsu F2MC-16LX Hardware Manual

12.3.4

Timing of 16-bit Free-run Timer

The 16-bit free-run timer is counted up by the input clock (internal or external clock).
When an external clock is selected, this timer is counted up at a rising edge.
Count Timing of Free-run Timer
Figure 12.3-6 shows the count timing for the free-run timer.
φ
External clock input
Count clock
Counter value
The counter can be cleared by a reset operation, software, and match operation with compare register 0.
Clearing the counter with a reset operation and software is performed as a clear is generated. Clearing the
counter with a match with compare register 0 is performed in sync with the count timing.
Free-run Timer Clear Timing (for a Match with Compare Register 0)
Figure 12.3-7 shows the free-run timer clear timing for a match with compare register 0.
Figure 12.3-7 Free-run Timer Clear Timing (for a Match with Compare Register 0)
φ
Compare
register value
Compare match
Counter value
Figure 12.3-6 Count Timing of Free-run Timer
N
N
CHAPTER 12 16-BIT I/O TIMER
N
N+1
0000
H
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