HD64F36912GFH Renesas Electronics America, HD64F36912GFH Datasheet - Page 327

• Manufacturer Part Number: HD64F36912GFH
• Description: IC H8 MCU FLASH 8K 32-QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H Tinyr

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: -

(4)
The low-voltage detection circuit is enabled after reset. To enable or disable the low-voltage
detection circuit correctly, follow the procedure described below. Figure 17.7 shows the timing for
the operation and release of the low-voltage detection circuit.
1. To disable the low-voltage detection circuit, clear all of the LVDRE, LVDDE, and LVDUE
2. To enable the low-voltage detection circuit, set the LVDE and BGRE bits in LVDCR to 1.
3. Wait for 50 s (t
bits to 0. Then, clear the LVDE and BGRE bits to 0. Set the VDDII bit in LVDCR if
necessary. The LVDE and BGRE bits must not be cleared to 0 at the same timing as the
LVDRE, LVDDE, and LVDUE bits because incorrect operation may occur.
When the voltages input on the ExtU and ExtD pins are used as the compared voltage, clear
the LVDDII bit to 0.
voltage-detection power supply have settled. Then, clear the LVDDF and LVDUF bits in
LVDSR to 0 and set the LVDRE, LVDDE, and LVDUE bits in LVDCR to 1, if necessary.
Operating Procedures for Enabling/Disabling LVDR and LVDI Circuits
Figure 17.7 Timing for Enabling/Disabling of Low-Voltage Detection Circuit
LVDE
BGRE
VDDII
LVDRE
LVDDE
LVDUE
Longer than one instruction operation time
LVDON
Section 17 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
) given by a software timer until the reference voltage and the low-
Rev. 3.00 Sep. 14, 2006 Page 297 of 408
t
LVDON
REJ09B0105-0300