R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 364

• 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 335 of 573
Table 22.7
TXD2
(P3_4 or P3_7)
RXD2
(P3_4, P3_7, or
P4_5)
CLK2 (P3_5)
CTS2/RTS2
(P3_3)
Table 22.7 lists the I/O Pin Functions in UART Mode.
Note that for a period from when the UART2 operating mode is selected to when transfer starts, the TXD2 pin
outputs “H”. (When N-channel open-drain output is selected, this pin is in the high-impedance state.)
Figure 22.7 shows the Transmit Timing in UART Mode. Figure 22.8 shows the Receive Timing in UART Mode.
Pin Name
I/O Pin Functions in UART Mode
Serial data output
Serial data input
I/O port
Transfer clock input
CTS input
RTS output
I/O port
Function
• RXD2 (P3_4)
• TXD2 (P3_4)
• TXD2 (P3_7)
• For reception only:
• RXD2 (P3_7)
• RXD2 (P4_5)
• For transmission only:
CLK2SEL0 bit in U2SR1 register = 0
CLK2SEL0 bit in U2SR1 register = 1
CKDIR bit in U2MR register = 1
PD3_5 bit in PD3 register = 0
CTS2SEL0 bit in U2SR1 register = 1
CRD bit in U2C0 register = 0
CRS bit in U2C0 register = 0
PD3_3 bit in PD3 register = 0
CTS2SEL0 bit in U2SR1 register = 1
CRD bit in U2C0 register = 0
CRS bit in U2C0 register = 1
CTS2SEL0 bit in U2SR1 register = 0
Bits TXD2SEL1 to TXD2SEL0 in U2SR0 register = 10b (P3_4)
Bits TXD2SEL1 to TXD2SEL0 in U2SR0 register = 01b (P3_7)
P3_4 and P3_7 can be used as ports by setting TXD2SEL1 to
TXD2SEL0 to 00b.
Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 01b (P3_4)
PD3_4 bit in PD3 register =0
Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 10b (P3_7)
PD3_7 bit in PD3 register = 0
Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 11b (P4_5)
PD4_5 bit in PD4 register = 0
P3_4, P3_7, and P4_5 can be used as ports by setting
RXD2SEL1 to RXD2SEL0 to 00b.
Selection Method
22. Serial Interface (UART2)