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11.4.3 Register Map
Watch Timer Counter Register
Watch Timer Data Register
Watch Timer Control Register
Table 11.4 Watch Timer Register Map
11.4.4 Watch Timer Register Description
The watch timer register consists of watch timer counter register (WTCNT), watch timer data register (WTDR), and
watch timer controlregister (WTCR). AsWTCR is 6-bit writable/ readable register, WTCR can control the clock source
(WTCK[1:0]), interrupt interval (WTIN[1:0]), and function enable/disable (WTEN). Also there is WT interrupt flag bit
(WTIFR).
11.4.5 Register Description for Watch Timer
WTCNT (Watch Timer Counter Register: Read Case): 89H
Initial value: 00H
WTDR (Watch Timer Data Register: Write Case): 89H
Initial value: 7FH
Clear WT Counter (auto clear after 1 Cycle)
Set WT period
WT Interrupt Interval=fwck/(2^14 x(7bit WTDR Value+1))
NOTE)
1. Do not write “0” in the WTDR register.