Datasheet

V850ES/JG3 CHAPTRER 8 16-BIT TIMER/EVENT COUNTER Q (TMQ)
R01UH0015EJ0300 Rev.3.00 Page 369 of 870
Sep 30, 2010
Figure 8-35. Basic Timing in Pulse Width Measurement Mode
FFFFH
16-bit counter
0000H
TQ0CE bit
TIQ0m pin input
TQ0CCRm register
INTTQ0CCm signal
INTTQ0OV signal
TQ0OVF bit
D 0 0000H D 1 D 2 D 3
Cleared to 0 by
CLR instruction
Remark m = 0 to 3
When the TQ0CE bit is set to 1, the 16-bit counter starts counting. When the valid edge input to the TIQ0m pin is later
detected, the count value of the 16-bit counter is stored in the TQ0CCRm register, the 16-bit counter is cleared to 0000H,
and a capture interrupt request signal (INTTQ0CCm) is generated.
The pulse width is calculated as follows.
Pulse width = Captured value × Count clock cycle
If the valid edge is not input to the TIQ0m pin even when the 16-bit counter counted up to FFFFH, an overflow interrupt
request signal (INTTQ0OV) is generated at the next count clock, and the counter is cleared to 0000H and continues
counting. At this time, the overflow flag (TQ0OPT0.TQ0OVF bit) is also set to 1. Clear the overflow flag to 0 by executing
the CLR instruction via software.
If the overflow flag is set to 1, the pulse width can be calculated as follows.
Pulse width = (10000H × TQ0OVF bit set (1) count + Captured value) × Count clock cycle
Remark m = 0 to 3