HD64F36912GFH Renesas Electronics America, HD64F36912GFH Datasheet - Page 321
HD64F36912GFH
Manufacturer Part Number
HD64F36912GFH
Description
IC H8 MCU FLASH 8K 32-QFP
Manufacturer
Renesas Electronics America
Series
H8® H8/300H Tinyr
Datasheet
1.DF36912GFHV.pdf
(442 pages)
Specifications of HD64F36912GFH
Core Processor
H8/300H
Core Size
16-Bit
Speed
12MHz
Connectivity
I²C, SCI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
18
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1.5K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
32-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD64F36912GFH
Manufacturer:
Renesas Electronics America
Quantity:
10 000
- Current page: 321 of 442
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17.3
17.3.1
Figure 17.3 shows the timing of the operation of the power-on reset circuit. As the power-supply
voltage rises, the capacitor which is externally connected to the RES pin is gradually charged via
the internal pull-up resistor (Typ. 150 k ). While the RES signal is driven low, the prescaler S and
the entire chip retains the reset state. When the level on the RES signal reaches the specified value,
the prescaler S is released from its reset state and it starts counting. The OVF signal is generated to
release the internal reset signal after the prescaler S has counted 131,072 cycles of the clock. The
noise filter circuit which removes noise with less than 400 ns (Typ.) is included to prevent the
incorrect operation of this LSI caused by noise on the RES signal.
To achieve stable operation of this LSI, the power supply needs to rise to its full level and settles
within the specified time. The maximum time required for the power supply to rise and settle
(t
pin (C
power supply, the power supply circuit should be designed to satisfy the following formula.
Note that the power supply voltage (Vcc) must fall below Vpor = 100 mV to remove charge on the
RES pin. After that, it can be risen. To remove charge on the RES pin, it is recommended that the
diode should be placed to Vcc. If the power supply voltage (Vcc) rises from the point above Vpor,
a power-on reset may not occur.
PWON
) is determined by the oscillation frequency (f
RES
t
). Where t
PWON
Operations
Power-On Reset Circuit
(t
(ms)
PWON
PWON
90
3000 ms, C
is assumed to be the time required to reach 90
Section 17 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
C
RES
( F)
RES
162/f
0.22 F, and f
OSC
(MHz)
OSC
OSC
) and capacitance which is connected to RES
= 10 in 2-MHz to 10-MHz operation)
Rev. 3.00 Sep. 14, 2006 Page 291 of 408
of the full level of the
REJ09B0105-0300
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