Timer A Operation States - Hitachi H8/3637 Hardware Manual

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
TCA Interval
Clock time base
TMA
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.
164
Reset Active Sleep
Reset Functions Functions Halted
Reset Functions Functions Functions Functions Functions Halted
Reset Functions Retained Retained Functions Retained Retained
Sub-
Watch active
Halted
Sub-
sleep Standby
Halted Halted