UPD70F3738GF-GAS-AX Renesas Electronics America, UPD70F3738GF-GAS-AX Datasheet - Page 862

• 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: -

23.9.3 RTC backup mode setting procedure
860
(1)
Notes1.
The RTC backup mode setting/exiting procedure as follows.
(a) Initial settings
(b) INTLVI routine
Setting the RTC backup mode
Caution
After the V
the following processing.
2. In the INTLVI interrupt servicing routine, if an NMI or INTWDT2 interrupt occurs while specifying the
3. If the option function is used to set WDTMD1 to 1 and fix WDT2 to the reset mode, WDT2 cannot be
4. In <4> above, if INTWDT2 is handled by clearing WDT2, and then INTWDT2 is generated while not
• Set RTCBUMCTL0 to 1 (specific sequence), and set up the status in which RTC backup mode is
•
•
After entering the RTC backup mode, execute the setting mode below.
operation. For detail, see CHAPTER 11 REAL-TIME COUNTER (
enabled.
In the INTLVI interrupt servicing routine, if a DMA operation occurs before stopping DMA operations and
the V
impossible to specify the RTC backup mode.
settings in <4>, interrupt servicing starts. If this servicing takes a while, the VDD voltage reaches the
minimum guaranteed voltage during the servicing and it becomes impossible to specify the RTC backup
mode.
stopped. If a reset occurs while these settings are specified, the RTC backup mode is exited according
to the exit settings specified in the reset initialization flow.
generating an external reset in the RTC backup mode, the RTC backup mode is exited.
(Use the LVIS register to set the low-voltage detection level to 2.8 V (TYP.) or 2.3 V (TYP.).)
Specify that the LVI be used as an interrupt.
<1> Read the low-voltage detection flag (LVIM.LVIF) and confirm that LVIM.LVIF = 1. If LVIM.LVIF =
<2> Set the operation clock in accordance with V
<3> Disable the DMA
<4> Prohibit NMIs (by clearing INTF02 and INTR02 to 0) and set up a status in which INTWD2 is not
<5> Set SOSCAMCTL.AMPHS to 1 (specific sequence), and set the subclock (fXT) to ultra low
<6> Set RTCBUMCTL0.RBMSET to 1 (specific sequence), and set the RTC backup mode.
<7> Set normal stop mode.
<8> RETI.
Use the RC1CC0.RC1CKS bit to specify the subclock (f
DD
DD
1, perform step <2> and the following steps. If LVIM.LVIF = 0, the V
to the LVI detection level, so do not specify the RTC backup mode (step <2> and the following),
and execute the exit processing in (3) Exiting the RTC backup mode (when no external reset
has occurred).
immediately generated (by clearing WDT2), or stop WDT2 or the WDT2 source clock Note2, 3, 4.
consumption mode.
In the subclock operation, the RTC backup mode is prohibited.
In the main clock operation, be sure to set the RTC backup mode.
voltage reaches the minimum guaranteed voltage before the DMA transfer finishes, it becomes
decreases and INTLVI interrupt occurrs, use the INTLVI interrupt servicing routine to execute
Note1
CHAPTER 23 STANDBY FUNCTION
.
User’s Manual U18953EJ5V0UD
DD
voltage (2.2 V@5 MHz, 2.0 V@2.5 MHz, etc).
XT
) as the operation clock and start RTC
μ
PD70F3792, 70F3793).
DD
voltage has not decreased