HD6413308 Hitachi Semiconductor, HD6413308 Datasheet - Page 160

• Manufacturer Part Number: HD6413308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: Hitachi Semiconductor

(3) Timing of Input Capture Flag (ICF) Clearing: The input capture flag ICFx (x = A, B, C, D)
is cleared when the CPU writes a “0” in this bit.
6.4.4 Setting of FRC Overflow Flag (OVF)
The FRC overflow flag (OVF) is set to “1” when the FRC overflows (changes from H’FFFF to
H’0000). Figure 6-18 shows the timing of this operation.
(2) Timing of Overflow Flag (OVF) Clearing: The overflow flag is cleared when the CPU
writes a “0” in this bit.
Ø
FRC
Internal overflow
signal
OVF
Ø
OVF
Ø
ICFx
Figure 6-18. Setting of Overflow Flag (OVF)
Figure 6-17. Clearing of Input Capture Flag
Write cycle: CPU writes "0" in OVF
Figure 6-19. Clearing of Overflow Flag
T
1
Write cycle: CPU writes "0" in ICFx
H'FFFF
T
1
T
2
T
2
145
T
3
T
3
Figure 6-17
H'0000