204
9.5.5
Timer Y Operating Modes
Timer Y operating modes are shown in table 9.16.
Table 9.16
Timer Y Operating Modes
Operation Mode
Reset
Active
Sleep
Watch
Sub-
active
Sub-
sleep
Standby
TCY
Interval
Reset
Functions
Functions
Halted
Halted
Halted
Halted
Auto-
reload
Reset
Functions
Functions
Halted
Halted
Halted
Halted
TMY
Reset
Functions
Retained
Retained
Retained
Retained
Retained
9.6
Watchdog Timer
9.6.1
Overview
The watchdog timer is equipped with an 8-bit counter that is incremented by an input clock.
An internal chip reset can be executed if the counter overflows because it is not updated
normally due to a system crash, etc.
Features: Features of the watchdog timer are given below.
•
Incremented by a ø/8192 internal clock
•
Reset signal generated on counter overflow
An overflow period of 1 to 256 times 8192/ø can be set.
(Approx. 2 ms to 500 ms when ø = 4.19 MHz)