MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 139

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(4) Pulse width measurement by means of restart
CR01 capture value
CR00 capture value
TM00 count value
Note Clear OVF00 by software.
When input of a valid edge to the TI000 pin is detected, the count value of 16-bit timer counter 00 (TM00) is taken
into 16-bit timer capture/compare register 01 (CR01), and then the pulse width of the signal input to the TI000 pin
is measured by clearing TM00 and restarting the count operation.
Either of two edges rising or falling can be selected using bits 4 and 5 (ES000 and ES001) of prescaler mode
register 00 (PRM00).
Sampling is performed using the count clock cycle selected by prescaler mode register 00 (PRM00) and a
capture operation is only performed when a valid level of the TI000 pin is detected twice, thus eliminating noise
with a short pulse width.
TI000 pin input
Count clock
INTTM01
OVF00
Figure 7-23. Timing of Pulse Width Measurement Operation with Free-Running Counter
0000H
t
and Two Capture Registers (with Rising Edge Specified)
0001H
CHAPTER 7 16-BIT TIMER/EVENT COUNTER 00
D0
(D1
D0
D0 + 1
User’s Manual U17890EJ2V0UD
D0)
t
D1
D1
D1 + 1
(10000H
FFFFH
D1 + D2)
0000H
t
D2
(D3
D2
D2 + 1
Note
D2)
t
D3
D3
137