NEC 78K0 User Manual page 142

Figure 6-18. Configuration Diagram for Pulse Width Measurement with Free-Running Counter
f
X
2
f /2
X
8
f /2
X
TI000
Figure 6-19. Timing of Pulse Width Measurement Operation with Free-Running Counter
t
Count clock
0000H
TM00 count value
TI000 pin input
CR010 capture value
INTTM010
OVF00
Note Clear OVF00 by software.
142
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
16-bit timer capture/compare
register 010 (CR010)
and One Capture Register (with Both Edges Specified)
0001H D0 D0 + 1
D0
(D1 − D0) × t
User's Manual U16227EJ2V0UD
16-bit timer counter 00
(TM00)
Internal bus
D1 D1 + 1 FFFFH 0000H
D1
(10000H − D1 + D2) × t
OVF00
INTTM010
D2 D3
D2 D3
Note
(D3 − D2) × t