hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 288

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 Timers
Name
Asynchro-
nous event
counter
Note: * The watchdog timer functions differently on the H8/38024, H8/38024S, H8/38024R Group
9.2
9.2.1
Timer A is an 8-bit timer with interval timing and real-time clock time-base functions. The clock
time-base function is available when a 32.768 kHz crystal resonator is connected as the subclock.
Features
Features of timer A are given below.
• Choice of eight internal clock sources (φ/8192, φ/4096, φ/2048, φ/512, φ/256, φ/128, φ/32,
• Choice of four overflow periods (1 s, 0.5 s, 0.25 s, 31.25 ms) when timer A is used as a clock
• An interrupt is requested when the counter overflows.
• Use of module standby mode enables this module to be placed in standby mode independently
Rev. 7.00 Mar 10, 2005 page 246 of 652
REJ09B0042-0700
φ/8).
time base (using a 32.768 kHz crystal resonator is connected as the subclock).
when not used.
and H8/38124 Group. See section 9.6, Watchdog Timer, for details.
Timer A
Overview
Functions
•
•
•
•
16-bit counter
Also usable as two
independent 8-bit
counters
Counts events
asynchronous to φ and φw
Can count asynchronous
events (rising/falling/both
edges) independ-ently of
the MCU's internal clock
Internal Clock
φ/2 to φ/8
(3 choices)
Event
Input Pin
AEVL
AEVH
IRQAEC
Waveform
Output Pin
—
Remarks