HD6412350 Hitachi, HD6412350 Datasheet - Page 547

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

12.4
During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI).
The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR.
12.5
12.5.1
If a timer counter clock pulse is generated during the T
takes priority and the timer counter is not incremented. Figure 12-8 shows this operation.
12.5.2
If bits CKS2 to CKS0 in TCSR are written to while the WDT is operating, errors could occur in
the incrementation. Software must stop the watchdog timer (by clearing the TME bit to 0) before
changing the value of bits CKS2 to CKS0.
Interrupts
Usage Notes
Contention between Timer Counter (TCNT) Write and Increment
ø
Address
Internal write signal
TCNT input clock
TCNT
Changing Value of CKS2 to CKS0
Figure 12-8 Contention between TCNT Write and Increment
TCNT write cycle
T
1
N
2
T
state of a TCNT write cycle, the write
2
Counter write data
M
527