upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 159

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

(6) Operation of OVF00 flag
(7) Conflicting operations
<1> The OVF00 flag is also set to 1 in the following case.
<2> Even if the OVF00 flag is cleared before the next count clock is counted (before TM00 becomes 0001H)
When a read period of the 16-bit timer capture/compare register (CR000/CR010) and a capture trigger input
(CR000/CR010 used as capture register) conflict, the priority is given to the capture trigger input. The data read
from CR000/CR010 is undefined.
When any of the following modes is selected: the mode in which clear & start occurs on a match between
TM00 and CR000, the mode in which clear & start occurs at the TI000 pin valid edge, or the free-running
mode
TM00 is counted up from FFFFH to 0000H.
after the occurrence of TM00 overflow, the OVF00 flag is re-set newly so this clear is not valid.
CR010 capture value
Capture read signal
TM00 count value
CR000 is set to FFFFH
Count clock
Edge input
INTTM010
Count clock
INTTM000
Figure 6-37. Capture Register Data Retention Timing
CR000
OVF00
TM00
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
Figure 6-36. Operation Timing of OVF00 Flag
X
N
FFFEH
FFFFH
User’s Manual U16961EJ4V0UD
N + 1
FFFFH
Capture
N + 2
0000H
0001H
N + 2
M
Capture, but
read value is
not guaranteed
M + 1
M + 1
M + 2
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