R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 338

• 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 309 of 573
Table 21.7
TXD0 (P1_4)
RXD0 (P1_5)
CLK0 (P1_6)
Table 21.7 lists the I/O Pin Functions in UART Mode.
After the UART0 operating mode is selected, the TXD0 pin outputs a “H” level until transfer starts. (If the NCH bit
is set to 1 (N-channel open-drain output), this pin is in the high-impedance state.)
Pin name
I/O Pin Functions in UART Mode
Serial data output
Serial data input
Programmable I/O port CLK0SEL0 bit in U0SR register = 0 (CLK0 pin not used)
Transfer clock input
Function
TXD0SEL0 bit in U0SR register = 1
For reception only:
P1_4 can be used as a port by setting TXD0SEL0 bit = 0.
RXD0SEL0 bit in U0SR register = 1
PD1_5 bit in PD1 register = 0
For transmission only:
P1_5 can be used as a port by setting RXD0SEL0 bit = 0.
CLK0SEL0 bit in U0SR register = 1
CKDIR bit in U0MR register = 1
PD1_6 bit in PD1 register = 0
Selection Method
21. Serial Interface (UART0)