NEC switch - Manual (Page 89)

CHAPTER 6 8-BIT TIMER/EVENT COUNTERS 00 AND 01
User’s Manual U12978EJ3V0UD
89
Figure 6-9. Timing of Square-Wave Output
Clear Clear
Interrupt acknowledged Interrupt acknowledged
Count start
Count clock
TM01 count value
CR01
TCE01
INTTM01
TO01 Note
N 01 00 N 01 00 N 00 01
N N N N
Note The initial value of TO01 when output is enabled (TOE01 = 1) becomes low level.