R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 187

• 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 158 of 573
Figure 14.1
Bits WDTRCS0 and WDTRCS1
Oscillation starts
when CSPRO = 1
CPU clock
Internal reset signal
Write to WDTR register
Note:
1. A value set by bits WDTUFS0 and WDTUFS1 is set in the watchdog timer (value when shipping: 3FFFh).
(“L” active)
Watchdog Timer Block Diagram
Low-speed on-chip oscillator
for watchdog timer
Prescaler
1/128
1/16
1/2
Refresh period
CM07 = 0,
WDTC7 = 1
control circuit
CM07 = 1
CM07 = 0,
WDTC7 = 0
CSPRO = 0
CSPRO: Bit in CSPR register
WDTC7: Bit in WDTC register
PM12: Bit in PM1 register
CM07: Bit in CM0 register
WDTUFS0, WDTUFS1, WDTRCS0, WDTRCS1: Bits in OFS2 register
CSPRO = 1
Watchdog timer
(Note 1)
14. Watchdog Timer
PM12 = 1
PM12 = 0
Watchdog
timer reset
Watchdog timer
interrupt request