UPD78F0500AMC-CAB-AX Renesas Electronics America, UPD78F0500AMC-CAB-AX Datasheet - Page 711

• Manufacturer Part Number: UPD78F0500AMC-CAB-AX
• Description: MCU 8BIT 30SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0500AMC-CAB-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2
(2) When detecting level of input voltage from external input pin (EXLVI)
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
• When starting operation
• When stopping operation
<1> Mask the LVI interrupt (LVIMK = 1).
<2> Set bit 2 (LVISEL) of the low-voltage detection register (LVIM) to 1 (detects level of input voltage from
<3> Clear bit 1 (LVIMD) of LVIM to 0 (generates interrupt signal when the level is detected) (default value).
<4> Set bit 7 (LVION) of LVIM to 1 (enables LVI operation).
<5> Use software to wait for an operation stabilization time (10
<6> Confirm that “input voltage from external input pin (EXLVI) ≥ detection voltage (V
<7> Clear the interrupt request flag of LVI (LVIIF) to 0.
<8> Release the interrupt mask flag of LVI (LVIMK).
<9> Execute the EI instruction (when vector interrupts are used).
Figure 25-8 shows the timing of the interrupt signal generated by the low-voltage detector. The numbers in this
timing chart correspond to <1> to <8> above.
Caution Input voltage from external input pin (EXLVI) must be EXLVI < V
Either of the following procedures must be executed.
•
•
When using 8-bit memory manipulation instruction:
Write 00H to LVIM.
When using 1-bit memory manipulation instruction:
Clear LVION to 0.
external input pin (EXLVI)).
detecting the falling edge of EXLVI, or “input voltage from external input pin (EXLVI) < detection voltage
(V
EXLVI
= 1.21 V (TYP.)” when detecting the rising edge of EXLVI, at bit 0 (LVIF) of LVIM.
CHAPTER 25 LOW-VOLTAGE DETECTOR
μ
s (MIN.)).
DD
.
EXLVI
= 1.21 V (TYP.)” when
711