9. Timers
Rev.3.00 Jul. 19, 2007 page 215 of 532
REJ09B0397-0300
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 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.
9.3 Timer
B
9.3.1 Overview
Timer B is an 8-bit timer that increments each time a clock pulse is input. This timer has two
operation modes, interval and auto reload.
Features
Features of timer B are given below.
•
Choice of seven internal clock sources (
φ
/8192,
φ
/2048,
φ
/512,
φ
/256,
φ
/64,
φ
/16,
φ
/4) or an
external clock (can be used to count external events).
•
An interrupt is requested when the counter overflows.
Block Diagram
Figure 9.2 shows a block diagram of timer B.
Summary of Contents for F-ZTAT H8 Series
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