R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 65

• Manufacturer Part Number: R5F21324CNSP#U0
• Description: MCU 1KB FLASH 16K ROM 20-LSSOP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/32Cr

Specifications of R5F21324CNSP#U0

• 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: -

R8C/32C Group
REJ09B0573-0100 Rev.1.00 Dec. 18, 2009
Page 36 of 573
5.7
Figure 5.8
5.8
The cold start-up/warm start-up determination function uses the CWR bit in the RSTFR register to determine cold
start-up (reset process) at power-on and warm start-up (reset process) when a reset occurred during operation.
The CWR bit is set to 0 (cold start-up) at power-on and also set to 0 at a voltage monitor 0 reset. If 1 is written to
the CWR bit by a program, it is set to 1. This bit remains unchanged at a hardware reset, software reset, or
watchdog timer reset.
The cold start-up/warm stat-up determination function uses voltage monitor 0 reset.
Figure 5.8 shows an Operating Example of Cold Start-Up/Warm Start-Up Function
The RSTFR register can be used to detect whether a hardware reset, software reset, or watchdog timer reset has
occurred.
If a hardware reset occurs, the HWR bit is set to 1 (detected). If a software reset occurs, the SWR bit is set to 1
(detected). If a watchdog timer reset occurs, the WDR bit is set to 1 (detected).
Cold Start-Up/Warm Start-Up Determination Function
Reset Source Determination Function
Operating Example of Cold Start-Up/Warm Start-Up Function
CWR bit in RSTFR register
Voltage monitor 0 reset
VCC
Vdet0
0V
5V
Set to 1 by
a program.
Set to 1 by
a program.
5. Resets