Timer A Operation States; Application Note - Renesas H8 Series Hardware Manual

Section 9 Timers
9.2.4

Timer A Operation States

Table 9.3 summarizes the timer A operation states.
Table 9.3 Timer A Operation States
Operation Mode
TCA Interval
Clock time base Reset
TMA
Note: When the real-time clock time base function is 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/φ (s) in
the count cycle.
9.2.5

Application Note

When bit 0 (TACKSTP) of the clock stop register 1 (CKSTPR1) is cleared to 0, bit 3 (TMA3) of
the timer mode register A (TMA) cannot be rewritten.
Set bit 0 (TACKSTP) of the clock stop register 1 (CKSTPR1) to 1 before rewriting bit 3 (TMA3)
of the timer mode register A (TMA).
Rev. 7.00 Mar 10, 2005 page 252 of 652
REJ09B0042-0700
Reset Active Sleep
Reset Functions Functions Halted
Functions Functions Functions Functions Functions Halted
Reset Functions Retained
Sub- Sub-
Watch active sleep
Halted Halted
Retained Functions Retained
Module
Standby Standby
Halted Halted
Halted
Retained Retained