R5F21191SP#U0 Renesas Electronics America, R5F21191SP#U0 Datasheet - Page 57

• Manufacturer Part Number: R5F21191SP#U0
• Description: IC R8C MCU FLASH 8K 20SSOP
• Manufacturer: Renesas Electronics America
• Series: M16C™ M16C/R8C/Tiny/19r

Specifications of R5F21191SP#U0

• Core Processor: R8C
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SIO, UART/USART
• Peripherals: LED, POR, Voltage Detect, WDT
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x1b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-SSOP
• For Use With: R0K521134S000BE - KIT EVAL STARTER FOR R8C/13R0E521174CPE10 - EMULATOR COMPACT R8C/18/19/1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/18 Group, R8C/19 Group
Rev.1.30
REJ09B0222-0130
7.
The voltage detection circuit monitors the input voltage to the VCC pin. This circuit can be used to monitor
the VCC input voltage by a program. Alternately, voltage monitor 1 reset, voltage monitor 2 interrupt, and
voltage monitor 2 reset can also be used.
Table 7.1 lists the Specifications of Voltage Detection Circuit and Figures 7.1 to 7.3 show the Block
Diagrams. Figures 7.4 to 7.6 show the Associated Registers.
Table 7.1
VCC monitor
Process when voltage is
detected
Digital filter
Voltage Detection Circuit
Apr 14, 2006
Specifications of Voltage Detection Circuit
Item
Page 40 of 233
Voltage to monitor
Detection target
Monitor
Reset
Interrupt
Switch
enabled/disabled
Sampling time
Vdet1
Passing through Vdet1
by rising or falling
None
Voltage monitor 1 reset
Reset at Vdet1 > VCC;
restart CPU operation at
VCC > Vdet1
None
Available
(Divide-by-n of fRING-S)
x 4
n: 1, 2, 4, and 8
Voltage Detection 1
Vdet2
Passing through Vdet2 by
rising or falling
VCA13 bit in VCA1
register
Whether VCC is higher or
lower than Vdet2
Voltage monitor 2 reset
Reset at Vdet2 > VCC;
restart CPU operation
after a specified time
Voltage monitor 2
interrupt
Interrupt request at Vdet2
> VCC and VCC > Vdet2
when digital filter is
enabled;
interrupt request at Vdet2
> VCC or VCC > Vdet2
when digital filter is
disabled
Available
(Divide-by-n of fRING-S)
x 4
n: 1, 2, 4, and 8
7. Voltage Detection Circuit
Voltage Detection 2