UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 312

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(3) Pulse width measurement
(4) External event counter
272
* The minimum pulse width that can be measured differs depending on the selected value of f
Detects the pulse width of the signal input to an external interrupt request input pins (INTP1/INTP2).
Counts the clock pulses input from the external interrupt request input pin (INTP2) (CI pin input pulses). The clocks
that can be input to timer/counter 2 are shown in Table 10-4.
The minimum pulse width that can be measured is the value of 4/f
Minimum pulse width
(High and low levels)
Maximum frequency
Table 10-3 Timer/Counter 2 Pulse Width Measurement Range
Table 10-4 Clocks Enabled to be Input to Timer/Counter 2
(0.32 s)
(0.64 s)
(1.28 s)
(2.56 s)
(5.12 s)
(10.2 s)
(20.5 s)
(41.0 s)
(81.9 s)
1024/f
2048/f
128/f
256/f
512/f
Measurable Pulse Width*
16/f
32/f
64/f
8/f
XX
CHAPTER 10 TIMER/COUNTER 2
XX
XX
XX
XX
XX
XX
XX
XX
When Counting One Edge
–
–
–
–
–
–
–
– 2
– 2
f
CLK
4/f
2
2
2
2
2
2
16
16
2
16
16
16
/8 (1.56 MHz)
CLK
(21.0 ms)
(41.9 ms)
(83.9 ms)
16
16
16
(168 ms)
(336 ms)
(671 ms)
16
(1.34 s)
(2.68 s)
(5.37 s)
(0.32 s)
1024/f
2048/f
128/f
256/f
512/f
16/f
32/f
64/f
8/f
( ): When f
XX
( ): When f
XX
XX
XX
XX
XX
XX
XX
XX
CLK
Resolution
or the value in the above table, whichever greater.
(0.32 s)
(0.64 s)
(1.28 s)
(2.56 s)
(5.12 s)
(10.2 s)
(20.5 s)
(41.0 s)
(81.9 s)
XX
1024/f
2048/f
128/f
256/f
512/f
16/f
32/f
64/f
8/f
CLK
= 25 MHz
XX
XX
XX
XX
XX
XX
XX
XX
XX
= 12.5 MHz and f
When Counting Both Edges
f
CLK
4/f
/8 (1.56 MHz)
CLK
(0.32 s)
XX
= 25 MHz
CLK
.