HD6413308 Hitachi Semiconductor, HD6413308 Datasheet - Page 178

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

7.3.4 Setting of TCSR Overflow Flag
(1) Setting of TCSR Overflow Flag (OVF): The overflow flag (OVF) is set to “1” when the
timer count overflows (changes from H’FF to H’00). Figure 7-10 shows the timing of this
operation.
(2) Timing of TCSR Overflow Flag (OVF) Clearing: The overflow flag (OVF) is cleared when
the CPU writes a “0” in this bit.
External reset
input (TMRI)
Internal clear
pulse
TCNT
ø Ø
TCNT
Internal overflow
signal
OVF
ø Ø
Figure 7-10. Setting of Overflow Flag (OVF)
Figure 7-9. Timing of External Reset
H’FF
N – 1
164
N
H’00
H’00