R5F21324CNSP#U0 Renesas Electronics America, R5F21324CNSP#U0 Datasheet - Page 322

• 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 293 of 573
21. Serial Interface (UART0)
The serial interface consists of two channels, UART0, UART2. This chapter describes the UART0.
21.1
Figure 21.1
UART0
RXD0
CLK0
UART0 has a dedicated timer to generate a transfer clock and operate independently. UART0 supports clock
synchronous serial I/O mode and clock asynchronous serial I/O mode (UART mode).
Figure 21.1 shows a UART0 Block Diagram. Figure 21.2 shows a Block Diagram of UART0 Transmit/Receive
Unit. Table 21.1 lists the Pin Configuration of UART0.
CLK1 and CLK0 = 00b
f32
fC
f1
f8
Overview
= 01b
= 10b
= 11b
polarity
switch
circuit
CLK
UART0 Block Diagram
Clock synchronous type
(internal clock selected)
CKDIR = 0
Internal
External
CKDIR = 1
U0BRG register
1/(n0+1)
1/16
1/16
1/2
Clock synchronous type
Clock synchronous type
Clock synchronous type
(internal clock selected)
Clock synchronous type
(external clock selected)
UART reception
UART transmission
Reception control
Transmission
control circuit
CKDIR = 0
CKDIR = 1
circuit
CKDIR: Bit in U0MR register
CLK0, CLK1: Bits in U0C0 register
Receive clock
Transmit clock
21. Serial Interface (UART0)
Transmit/
receive
unit
TXD0