upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 147

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(4) Pulse width measurement by means of restart
CR010 capture value
CR000 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 010 (CR010), 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
INTTM010
OVF00
Figure 6-23. Timing of Pulse Width Measurement Operation with Free-Running Counter
0000H
t
and Two Capture Registers (with Rising Edge Specified)
0001H
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
D0
(D1
D0
User’s Manual U16961EJ4V0UD
D0 + 1
D0)
t
D1
D1
D1 + 1
(10000H
FFFFH
D1 + D2)
0000H
t
D2
(D3
D2 + 1
D2
Note
D2)
t
D3
D3
147