UPD70F3738GF-GAS-AX Renesas Electronics America, UPD70F3738GF-GAS-AX Datasheet - Page 885

• Manufacturer Part Number: UPD70F3738GF-GAS-AX
• Description: MCU 32BIT V850ES/JX3-L 100-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Lr

Specifications of UPD70F3738GF-GAS-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: CSI, EBI/EMI, I²C, UART/USART
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 84
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 2.2 V ~ 3.6 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

26.3 Registers
The low-voltage detector is controlled by the following registers.
• Low voltage detection register (LVIM)
• Low voltage detection level select register (LVIS)
(1) Low voltage detection register (LVIM)
The LVIM register is a special register. This can be written only in a combination of specific sequences (see
3.4.7 Special registers).
The LVIM register is used to enable or disable low voltage detection, and to set the operation mode of the low-
voltage detector.
This register can be read or written in 8-bit or 1-bit units. However, the LVIF bit is read-only.
After reset: Note 1
LVIM
Notes 1. Reset by low-voltage detection: 82H
Cautions 1. When the LVION and LVIMD bits are set to 1, the low-voltage detector cannot be
2. Do not change the LVION bit from 1 to 0 while the supply voltage (V
3. After the LVI operation has started (LVION bit = 1), check the LVIF bit.
4. When the INTLVI signal is generated, check the LVIF bit to see whether the supply voltage
LVIF
LVION
LVION
LVIMD
2. When the LVION bit is set to 1, the comparator in the LVI circuit starts operating.
3. Be sure to set bits 6 to 2 to “0”.
<7>
Reset due to other source:
detection voltage (V
has fallen below or exceeds the detection voltage.
Notes 2, 3, 4
0
1
0
1
0
1
Wait at least 0.2 ms, set by software, before checking the voltage by using the
LVIF bit after the LVION bit is set.
stopped until a reset request due to other than low-voltage detection is
generated.
Disable operation.
Enable operation.
Generate interrupt request signal INTLVI when supply voltage drops below or
rises above detection voltage.
Generate internal reset signal LVIRES when supply voltage drops below detection
voltage.
Supply voltage rises above detection voltage, or operation is disabled.
Supply voltage of connected power supply is lower than detection voltage.
CHAPTER 26 LOW-VOLTAGE DETECTOR (LVI)
R/W
6
0
Address: FFFFF890H
LVI
User’s Manual U18953EJ5V0UD
Selection of operation mode of low-voltage detector
) (LVIM.LVIF bit = 1).
5
0
Low voltage detection enable or disable
00H
Low voltage detection flag
4
0
3
0
0
2
LVIMD
<1>
DD
) is lower than the
LVIF
<0>
883