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CHAPTER 9 TIMER/COUNTER FUNCTION (REAL-TIME PULSE UNIT)
9.3 Timer 2
9.3.1 Features (timer 2)
Timers 20, 21 (TM20, TM21) are 16-bit general-purpose timer units that perform the following operations.
• Pulse interval or frequency measurement and programmable pulse output
• Interval timer
• PWM output timer
• 32-bit capture timer when 2 timer/counter channels are connected in cascade
(In this case, four 32-bit capture register channels can be used.)
9.3.2 Function overview (timer 2)
•
16-bit timer/counter (TM20, TM21): 2 channels
•
Bit length
Timer 2 registers (TM20, TM21): 16 bits
During cascade operation: 32 bits (higher 16 bits: TM21, lower 16 bits: TM20)
•
Capture/compare register
In 16-bit mode: 6
In 32-bit mode: 4 (capture mode only)
•
Count clock division selectable by prescaler (set the frequency of the count clock to 8 MHz or less)
•
Base clock (f
): 2 types (set f
CLK
f
/2 and f
/4 can be selected
XX
XX
•
Prescaler division ratio
The following division ratios can be selected according to the base clock (f
Division Ratio
334
to 16 MHz or less)
CLK
Base Clock (f
f
/2 Selected
XX
1/2
f
/4
XX
1/4
f
/8
XX
1/8
f
/16
XX
1/16
f
/32
XX
1/32
f
/64
XX
1/64
f
/128
XX
1/128
f
/256
XX
User's Manual U14492EJ3V0UD
).
CLK
)
CLK
f
/4 Selected
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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