DF36912GFH Renesas Electronics America, DF36912GFH Datasheet - Page 323

• Manufacturer Part Number: DF36912GFH
• Description: MCU 3/5V 8K 32-LQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300H Tinyr

Specifications of DF36912GFH

• 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: Lead free / RoHS Compliant
• Eeprom Size: -

(2)
Figure 17.5 shows the timing of the operation of the LVDI circuit.
The LVDI circuit is enabled after a power-on reset, however, the interrupt request is disabled. To
enable the LVDI, the LVDDF bit and LVDUF bit in LVDSR must be cleared to 0 and then the
LVDDE bit or LVDUE bit in LVDCR must be set to 1. After that, the output settings of ports
must be made.
To cancel the LVDI, follow the procedures written in section 17.3.2 (4), Operating Procedures for
Enabling/Disabling LVDR and LVDI Circuits.
To restart the LVDI circuit after standby mode, set the LVDE bit to 1, write 1 to VDDII (if
necessary), and wait for 50 s (t
low-voltage detection power supply have settled. Then, clear the LVDDF and LVDUF bits to 0
and set the LVDDE or the LVDUE bit to 1. After that, the output settings of ports must be made.
When the power-supply voltage falls below Vint (D) (Typ. = 3.7 V) voltage, the LVDI circuit
clears the LVDINT signal to 0 and sets the LVDDF bit to 1. If the LVDDE bit is 1 at this time, an
IRQ0 interrupt request is generated. In this case, the necessary data must be saved in the external
Low Voltage Detection Interrupt (LVDI) Circuit
(When Internally Generated Voltage is used for Detection)
V
LVDRES
V
PSS-reset
signal
OVF
Internal reset
signal
LVDRmin
CC
Figure 17.4 Operating Timing of LVDR Circuit
Section 17 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
LVDON
) given by a software timer until the reference voltage and the
PSS counter starts
131,072 cycles
Rev. 3.00 Sep. 14, 2006 Page 293 of 408
Reset released
REJ09B0105-0300
Vreset
V
SS