UPD78F0386GK-8EU-A Renesas Electronics America, UPD78F0386GK-8EU-A Datasheet - Page 538

• Manufacturer Part Number: UPD78F0386GK-8EU-A
• Description: MCU 96KB FLASH 5KB RAM
• Manufacturer: Renesas Electronics America
• Series: 78K0/Lx2r

Specifications of UPD78F0386GK-8EU-A

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LCD, LVD, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

24.5 Cautions for Low-Voltage Detector
(V
(1) When used as reset
(2) When used as interrupt
(1) When used as reset
(2) When used as interrupt
536
LVI
In a system where the supply voltage (V
In this system, take the following actions.
<Action>
(a) Check that “supply voltage (V
(b) In a system where the supply voltage fluctuation period is long in the vicinity of the LVI detection voltage, wait
Remark If bit 2 (LVISEL) of the low voltage detection register (LVIM) is set to “1”, the meanings of the above
), the operation is as follows depending on how the low-voltage detector is used.
The system may be repeatedly reset and released from the reset status.
In this case, the time from release of reset to the start of the operation of the microcontroller can be arbitrarily set
by taking action (1) below.
Interrupt requests may be frequently generated. Take (b) of action (2) below.
After releasing the reset signal, wait for the supply voltage fluctuation period of each system by means of a
software counter that uses a timer, and then initialize the ports (see Figure 24-9).
using bit 0 (LVIF) of the low-voltage detection register (LVIM). Clear bit 0 (LVIIF) of interrupt request flag
register 0L (IF0L) to 0.
for the supply voltage fluctuation period, check that “supply voltage (V
LVIF flag, and clear the LVIIF flag to 0.
words change as follows.
Supply voltage (V
Detection voltage (V
DD
)
LVI
CHAPTER 24 LOW-VOLTAGE DETECTOR
)
DD
)
DD
Input voltage from external input pin (EXLVI)
Detection voltage (V
) fluctuates for a certain period in the vicinity of the LVI detection voltage
detection voltage (V
User’s Manual U17504EJ2V0UD
EXLVI
LVI
)” in the servicing routine of the LVI interrupt by
= 1.21 V
Note
DD
)
)
detection voltage (V
LVI
)” using the