H838024 datasheet(294/697 Pages) RENESAS

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Section 9 Timers

Rev. 7.00 Mar 10, 2005 page 252 of 652

REJ09B0042-0700

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

Reset

Active

Sleep

Watch

Sub-

active

Sub-

sleep

Standby

Module

Standby

TCA Interval

Reset

Functions Functions Halted

Halted

Clock time base

Reset

Functions Functions Functions Functions Functions Halted

Halted

TMA

Reset

Functions Retained

Retained

Functions Retained

Retained

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).

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