HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 351

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

12.3.4
In the interval timer mode, when the TCNT overflows the OVF flag is set to 1 and an interval
timer interrupt is requested (figure 12.6).
12.3.5
When the TCNT overflows the WOVF bit of the RSTCSR is set to 1 and a WDTOVF signal is
output. When the RSTE bit is set to 1, TCNT overflow enables an internal reset signal to be
generated for the entire chip (figure 12.7).
Overflow signal
(internal signal)
Overflow signal
(internal signal)
Timing of Setting the Overflow Flag (OVF)
Timing of Setting the Watchdog Timer Overflow Flag (WOVF)
WOVF
TCNT
CK
Figure 12.7 Timing of Setting the WOVF Bit and Internal Reset
TCNT
OVF
CK
Figure 12.6 Timing of Setting the OVF
H'FF
H'FF
H'00
H'00
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