hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 264

• Manufacturer Part Number: hd66100
• Description: H8/3867 Series
• Manufacturer: Renesas Electronics Corporation.

9.7.5
1. When reading the values in ECH and ECL, first clear bits CUEH and CUEL to 0 in ECCSR to
2. Use a clock with a frequency of up to 6 MHz (Internal step-down circuit not used: V
Mode
16-bit mode
8-bit mode
8-bit mode
8-bit mode
3. When AEC uses with 16-bit mode, set CUEH in ECCSR to “1” first, set CRCH in ECCSR to
prevent asynchronous event input to the counter. The correct value will not be returned if the
event counter increments while being read.
When clear bits CUEH and CUEL to 0 in ECCSR, ECH and ECL sometimes count up.
to 5.5 V), up to 4 MHz (Internal step-down circuit not used: V
MHz (internal step-down circuit not used: V
V), up to 1 MHz (others) for input to the AEVH and AEVL pins, and ensure that the high and
low widths of the clock are at least 83 ns. The duty cycle is immaterial.
“1” second, or set both CUEH and CRCH to “1” at same time before clock entry. While AEC
is operating on 16-bit mode, do not change CUEH. Otherwise, ECH will be miscounted up.
Application Notes
Active (high-speed), sleep (high-speed)
Active (medium-speed), sleep (medium-speed) (ø/16)
f
Watch, subactive, subsleep, standby
øw = 32.768 kHz or 38.4 kHz
OSC
= 400 kHz to 4 MHz
CC
= 2.7 to 5.5 V), up to 2 MHz (V
(ø/32)
(ø/64)
(ø/128)
(øw/2)
(øw/4)
(øw/8)
CC
= 3.0 to 5.5 V), up to 3.2
Maximum AEVH/AEVL Pin
Input Clock Frequency
Internal step-down circuit
not used:
V
V
V
V
Other than above/1 MHz
Internal step-down circuit
used:
V
Other than above/1 MHz
2 · f
f
1/2 · f
1/4 · f
1000 kHz
500 kHz
250 kHz
OSC
CC
CC
CC
CC
CC
OSC
= 4.5 to 5.5 V/6 MHz
= 3.0 to 5.5 V/4 MHz
= 2.6 to 5.5 V/3.2 MHz
= 2.2 to 5.5 V/2 MHz
= 2.2 to 5.5 V/2 MHz
OSC
OSC
CC
= 2.2 to 5.5
CC
= 4.5
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