HD6473847RHV Datasheet, PDF (249/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 9 Timers
9.2 Timer A
The timer A is an 8-bit timer with interval timing and realtime clock time-base functions. The
clock time-base function is available when a 32.768kHz crystal oscillator is connected. Figure 9.1
shows a block diagram of the timer A.
9.2.1 Features
• The timer A can be used as an interval timer or a clock time base.
• An interrupt is requested when the counter overflows.
• Use of module standby mode enables this module to be placed in standby mode independently
when not used. (For details, refer to section 5.4, Module Standby Function.)
Interval Timer
• Choice of eight internal clock sources (φ/8192, φ/4096, φ/2048, φ/512, φ/256, φ/128, φ/32, and
φ8)
Clock Time Base
• Choice of four overflow periods (1 s, 0.5 s, 0.25 s, and 31.25 ms) when timer A is used as a
clock time base (using a 32.768 kHz crystal oscillator).
Rev. 7.00 Mar. 08, 2010 Page 217 of 510
REJ09B0024-0700