R5F21324ANSP#U1 Renesas Electronics America, R5F21324ANSP#U1 Datasheet - Page 67

• Manufacturer Part Number: R5F21324ANSP#U1
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Ar

Specifications of R5F21324ANSP#U1

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 15
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 20-LSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Under development
R8C/32A Group
REJ09B0458-0020 Rev.0.20
Page 37 of 583
6.
The voltage detection circuit monitors the voltage input to the VCC pin. This circuit can be used to monitor the VCC
input voltage by a program.
6.1
Table 6.1
VCC
monitor
Process at
voltage
detection
Digital filter
The detection voltage of voltage detection 0 can be selected among four levels using the OFS register.
The detection voltage of voltage detection 1 can be selected among 16 levels using the VD1LS register.
As a detection target, the voltage input to VCC and the LVCMP2 pin can be switched for voltage detection 2 only.
The voltage monitor 0 reset, and voltage monitor 1 interrupt and voltage monitor 2 interrupt can also be used.
Note that voltage monitor 1 and voltage monitor 2 share the voltage detection circuit with comparator A1 and
comparator A2. Either voltage monitor 1 and voltage monitor 2 or comparator A1 and comparator A2 can be
selected.
Voltage Detection Circuit
Overview
Item
Voltage to
monitor
Detection
target
Detection
voltage
Monitor
Reset
Interrupts
Switching
enable/disable
Sampling
time
Voltage Detection Circuit Specifications
Preliminary specification
Specifications in this manual are tentative and subject to change.
Vdet0
Whether passing through
Vdet0 by falling
Selectable among
4 levels using the OFS
register.
None
Voltage monitor 0 reset
Reset at Vdet0 > VCC;
CPU operation restarts
at VCC > Vdet0
None
No digital filter function
—
Nov 05, 2008
Voltage Monitor 0
Supported
Vdet1
Whether passing through
Vdet1 by rising or falling
Selectable among
16 levels using the VD1LS
register.
The VW1C3 bit in
the VW1C register
Whether VCC is higher or
lower than Vdet1
None
Voltage monitor 1 interrupt
Non-maskable or maskable
selectable
Interrupt request at:
Vdet1 > VCC
and/or
VCC > Vdet1
(fOCO-S divided by n) × 2
n: 1, 2, 4, and 8
Voltage Monitor 1
Vdet2
Whether passing through
Vdet2 by rising or falling
The input voltage to VCC
and the LVCMP2 pin can be
switched by the VCA24 bit
in the VCA2 register.
The detection voltage level
varies depending on when
VCC is selected or when
LVCMP2 is selected.
Each value is set as the
fixed level.
The VCA13 bit in
the VCA1 register
Whether VCC or LVCMP2
input voltage is higher or
lower than Vdet2
None
Voltage monitor 2 interrupt
Non-maskable or maskable
selectable
Interrupt request at:
Vdet2 > VCC (LVCMP2)
and/or
VCC (LVCMP2) > Vdet2
Supported
(fOCO-S divided by n) × 2
n: 1, 2, 4, and 8
6. Voltage Detection Circuit
Voltage Monitor 2