164
Clock Output: Setting bit TMOW in port mode register 1 (PMR1) to 1 causes a clock signal to be
output at pin TMOW. Eight different clock output signals can be selected by means of bits TMA7
to TMA5 in TMA. The system clock divided by 32, 16, 8, or 4 can be output in active mode and
sleep mode. A 32.768 kHz signal divided by 32, 16, 8, or 4 can be output in active mode, sleep
mode, and subactive mode.
9.2.4
Timer A Operation States
Table 9.4 summarizes the timer A operation states.
Table 9.4
Timer A Operation States
Operation Mode
Reset
Active
Sleep
Watch
Sub-
active
Sub-
sleep
Standby
TCA Interval
Reset
Functions Functions Halted
Halted
Halted
Halted
Clock time base
Reset
Functions Functions Functions Functions Functions Halted
TMA
Reset
Functions Retained
Retained
Functions Retained
Retained
Note:
When real-time clock time-base functions are selected as the internal clock of TCA in active
mode or sleep mode, the internal clock is not synchronous with the system clock, so it is
synchronized by a synchronizing circuit. This may result in a maximum error of 1/ø (s) in the
count cycle.