511
Chapter 11
16-bit Timer/Event Counter T
User’s Manual U16580EE3V1UD00
11.6.7 Pulse width measurement mode
In the pulse width measurement mode, counting is performed in the free-running mode. The counter
value is saved to the TTnCCR0 register, and the counter is cleared to 0000H. As a result, the external
input pulse width can be measured. However, when measuring a long pulse width that exceeds counter
overflow, perform judgment with the overflow flag. Measurement of pulses during which overflow occurs
twice or more is not possible, so adjust the counter's operating frequency. Even in the case of TITn1 pin
edge detection, pulse width measurement can be similarly performed by using the TTnCCR1 register.
Cautions: 1. In the pulse width measurement mode the external event clock input (TEVTTn) is
prohibited (TTnCTL1.TTnEEE = 0).
2. When an internal count clock
≤
f
XX
/16 (TTnCTL0.TTnCKS2-0) is selected in pulse
width measurement mode, and a valid signal edge is input before the first count
up, the a value of FFFFH will be captured in the corresponding TTnCCR0 or
TTnCCR1 register.
Figure 11-33:
Basic Operation Timing in Pulse Width Measurement Mode
(a) (TTnOE0, 1 = 0, TTnOL0, 1 = 0)
Remarks: 1.
D
00
, D
01
, D
02
, D
03
: Values captured to TTnCCR0 register (0000H to FFFFH)
2.
TITn0: Setting to rising edge/falling edge (both edges) detection (TTnIOC1 register
bits TTnIS1, TTnIS0 = 1B)
3.
n = 0, 1
Counter
FFFFH
INTTTnCC0
TITn0
TTnCE
TTnOVF
D
00
TTnCCR0
0000H
D
00
D
01
D
02
D
03
D
01
D
02
D
03
FFFFH
INTTTnOV
Cleared through 0
write from CPU
Содержание MuPD70F3187
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Страница 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 192: ...192 Chapter 5 Memory Access Control Function μPD70F3187 only User s Manual U16580EE3V1UD00 MEMO ...
Страница 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO ...
Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
Страница 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO ...
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Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Страница 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Страница 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
Страница 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO ...
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