Timer 3; Features (Timer 3); Function Overview (Timer 3) - NEC UPD703116 User Manual

9.4 Timer 3

9.4.1 Features (timer 3)

Timer 3 (TM3) is a 16-bit timer/counter that can perform the following operations.
• Interval timer function
• PWM output
• External signal cycle measurement

9.4.2 Function overview (timer 3)

•
16-bit timer/counter (TM3): 1 channel
•
Capture/compare registers: 2
•
Count clock division selectable by prescaler (set the frequency of the count clock to 16 MHz or less)
•
Base clock (f ): 2 types (set f
CLK
f and f /2 can be selected
XX XX
•
Prescaler division ratio
The following division ratios can be selected according to the base clock (f
Division Ratio
•
Interrupt request sources
• Capture/compare match interrupt requests: 2 sources
In case of capture register: INTCC3n generated by INTP3n input
In case of compare register: INTCC3n generated by CC3n match signal
• Overflow interrupt request: 1 source
INTTM3 generated upon overflow of TM3 register
•
Timer/counter count clock sources: 2 types
(Selection of external pulse input, internal system clock cycle)
•
One of two operation modes when the timer/counter overflows can be selected: free-running mode or overflow
stop mode
•
The timer/counter can be cleared by match of timer/counter and compare register
•
External pulse output (TO3): 1
Remarks 1. f : Internal system clock
XX
2. n = 0, 1
CHAPTER 9 TIMER/COUNTER FUNCTION
to 32 MHz or less)
CLK
Base Clock (f
f Selected
XX
1/2 f /2
XX
1/4 f /4
XX
1/8 f /8
XX
1/16 f /16
XX
1/32 f /32
XX
1/64 f /64
XX
1/128 f /128
XX
1/256 f /256
XX
User's Manual U14492EJ5V0UD
).
CLK
)
CLK
f /2 Selected
XX
f /4
XX
f /8
XX
f /16
XX
f /32
XX
f /64
XX
f /128
XX
f /256
XX
f /512
XX
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