R5F21346CNFP#U0 Renesas Electronics America, R5F21346CNFP#U0 Datasheet - Page 489

• Manufacturer Part Number: R5F21346CNFP#U0
• Description: MCU 1KB FLASH 32K ROM 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/34Cr

Specifications of R5F21346CNFP#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: 43
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/34C Group
REJ09B0586-0100 Rev.1.00 Jan 13, 2010
Page 456 of 723
23. Serial Interface (UART2)
The serial interface consists of three channels, UART0 to UART2. This chapter describes the UART2.
23.1
Figure 23.1
CTS2/RTS2
UART2 has a dedicated timer to generate a transfer clock.
Figure 23.1 shows a UART2 Block Diagram. Figure 23.2 shows a Block Diagram of UART2 Transmit/Receive
Unit. Table 23.1 lists the Pin Configuration of UART2.
UART2 has the following modes:
• Clock synchronous serial I/O mode
• Clock asynchronous serial I/O mode (UART mode)
• Special mode 1 (I
• Multiprocessor communication function
RXD2
SMD2 to SMD0, CKDIR: Bits in U2MR register
CLK1, CLK0, CKPOL, CRD, CRS: Bits in U2C0 register
DF2EN: Bit in URXDF register
CLK2
f32
Clock source selection
fC
f1
f8
Overview
= 00b
= 01b
= 10b
= 11b
CLK1 to CLK0
switching
CKPOL
polarity
CTS/RTS selected
circuit
UART2 Block Diagram
CLK
CKDIR
= 1
CKDIR
= 0
CRS = 0
2
Digital filter
C mode)
CRS = 1
CKDIR
internal
CKDIR
external
Clock synchronous type
(internal clock selected)
switching circuit
CTS/RTS disabled
RXD polarity
1/(n+1)
U2BRG
register
CRD = 0
CRD = 1
VSS
DF2EN = 1
DF2EN = 0
CTS/RTS disabled
1/16
1/16
1/2
Clock synchronous type
(external clock selected)
Clock synchronous type
(internal clock selected)
Clock synchronous type
Clock synchronous type
= 010b, 100b, 101b, 110b
UART reception
UART transmission
= 100b, 101b, 110b
= 001b, 010b
n: Setting value in U2BRG register
CKDIR = 0
CKDIR = 1
= 001b
RTS2
CTS2
SMD2 to SMD0
control circuit
Transmission
control circuit
Reception
Receive
clock
Transmit
clock
23. Serial Interface (UART2)
Transmit/
receive
unit
switching
polarity
circuit
TXD
TXD2