hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 353

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

9.7
9.7.1
The asynchronous event counter is incremented by external event clock or internal clock input.
Features
Features of the asynchronous event counter are given below.
• Can count asynchronous events
• Can also be used as two independent 8-bit event counter channels.
• Can be used as single-channel independent 16-bit event counter.
• Event/clock input is enabled only when IRQAEC is high or event counter PWM output
• Both edge sensing can be used for IRQAEC or event counter PWM output (IECPWM)
• When an event counter PWM is used, event clock input enabling/disabling can be performed
• External event input or a prescaler output clock can be selected by software for the ECH and
• Both edge counting is possible for AEVL and AEVH.
• Counter resetting and halting of the count-up function controllable by software
• Automatic interrupt generation on detection of event counter overflow
• Use of module standby mode enables this module to be placed in standby mode independently
Can count external events input asynchronously without regard to the operation of base clocks
φ and φ
The counter has a 16-bit configuration, enabling it to count up to 65536 (2
(IECPWM) is high.
interrupts. When the asynchronous counter is not used, independent interrupt function use is
possible.
automatically in a fixed cycle.
ECL clock sources. φ/2, φ/4, or φ/8 can be selected as the prescaler output clock.
when not used.
Asynchronous Event Counter (AEC)
Overview
SUB
.
Rev. 7.00 Mar 10, 2005 page 311 of 652
16
) events.
REJ09B0042-0700
Section 9 Timers