Timer A Operation States; Timer B1; Overview - Renesas H8 Series Hardware Manual

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 Reset Functions Functions Functions Functions Functions Halted
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.
9.3

Timer B1

9.3.1

Overview

Timer B1 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 B1 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.
Reset Active Sleep
Reset Functions Functions Halted
Reset Functions Retained Retained Functions Retained Retained
Sub-
Watch active
Halted
Rev. 6.00 Sep 12, 2006 page 209 of 526
Section 9 Timers
Sub-
sleep Standby
Halted Halted
REJ09B0326-0600