HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 262

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.4
11.4.1
If a timer counter clock pulse is generated during the T
the write takes priority and the timer counter is not incremented. See figure 11.7.
11.4.2
Software should stop the watchdog timer (by clearing the TME bit to 0) before changing the value
of the clock select bits. If the clock select bits are modified while the watchdog timer is running,
the timer count may be incremented incorrectly.
11.4.3
TCSR bits, except bits 0–2, and the TCNT counter are reset when the chip recovers from software
standby mode. Re-initialize the watchdog timer as necessary to resume normal operation.
230
Application Notes
Contention between TCNT Write and Increment
Changing the Clock Select Bits (CKS2 to CKS0)
Recovery from Software Standby Mode
ø
Internal address bus
Internal write signal
TCNT clock pulse
TCNT
Figure 11.7 TCNT Write-Increment Contention
Write cycle (CPU writes to TCNT)
T
1
TCNT address
3
state of a write cycle to the timer counter,
T
2
N
Counter write data
T
3
M