CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
Preliminary User’s Manual U16315EJ1V0UD
160
(7) Operation of OVF00 flag
<1>
The OVF00 flag is set to 1 in the following case.
When of the following modes: the mode in which clear & start occurs on a match between TM00 and
CR000, the mode in which clear & start occurs on a TI00 valid edge, or the free-running mode, is selected
↓
CR000 is set to FFFFH
↓
TM00 is counted up from FFFFH to 0000H.
Figure 6-35. Operation Timing of OVF00 Flag
Count clock
CR000
TM00
OVF00
INTTM000
FFFFH
FFFEH
FFFFH
0000H
0001H
<2>
Even if the OVF00 flag is cleared before the next count clock (before TM00 becomes 0001H) after the
occurrence of TM00 overflow, the OVF00 flag is re-set newly and clear is disabled.
(8) Conflicting operations
Conflict between the read period of the 16-bit timer capture/compare register (CR000/CR010) and capture trigger
input (CR000/CR010 used as capture register)
Capture trigger input has priority. The data read from CR000/CR010 is undefined.
(9) Timer operation
<1>
Even if 16-bit timer counter 00 (TM00) is read, the value is not captured by 16-bit timer capture/compare
register 010 (CR010).
<2>
Regardless of the CPU’s operation mode, when the timer stops, the input signals to the TI000/TI010 pins
are not acknowledged.
<3>
The one-shot pulse output mode operates correctly only in the free-running mode and the mode in which
clear & start occurs at the TI000 valid edge. In the mode in which clear & start occurs on a match between
the TM00 register and CR000 register, one-shot pulse output is not possible because an overflow does not
occur.
Содержание 78K0/KD1 Series
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