NEC 78014Y Series, User Manual

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172
CHAPTER 8 16-BIT TIMER/EVENT COUNTER
Table 8-1. Timer/Event Counter Operation
16-Bit Timer/ 8-Bit Timer/ Watch Timer Watchdog
Event Counter Event Counter Timer
Operation Interval timer 1 channel 2 channels 1 channel Note 1 1 channel Note 2
mode External event counter — —
Function Timer output — —
PWM output — — —
Pulse width measurement — — —
Square-wave output — —
Interrupt request
Test input — — —
Notes 1. Watch timer can perform both watch timer and interval timer functions at the same time.
2. Watchdog timer can perform either the watchdog timer function or the interval timer function.
8.2 16-Bit Timer/Event Counter Functions
The 16-bit timer/event counter (TM0) has the following functions.
• Interval timer
• PWM output
• Pulse width measurement
• External event counter
• Square-wave output
PWM output and pulse width measurement functions at the same time.
(1) Interval timer
TM0 generates interrupt requests at the preset time interval.
Table 8-2. 16-Bit Timer/Event Counter Interval Times
Minimum Interval Time Maximum Interval Time Resolution
2
×
TI0 input cycle 2 16
×
TI0 input cycle TI0 input edge cycle
2 2
×
1/f
X
(400 ns) 2 17
×
1/f
X
(13.1 ms) 2
×
1/f
X
(200 ns)
2 3
×
1/f
X
(800 ns) 2 18
×
1/f
X
(26.2 ms) 2 2
×
1/f
X
(400 ns)
2 4
×
1/f
X
(1.6
µ
s) 2 19
×
1/f
X
(52.4 ms) 2 3
×
1/f
X
(800 ns)
Remarks 1. f
X
: Main system clock oscillation frequency
2. Values in parentheses apply to operation with f
X
= 10.0 MHz