R5F2121AJFP#U0 Renesas Electronics America, R5F2121AJFP#U0 Datasheet - Page 283

• Manufacturer Part Number: R5F2121AJFP#U0
• Description: MCU FLASH 96K 5K CMOS 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/21r

Specifications of R5F2121AJFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, Voltage Detect, WDT
• Number Of I /o: 41
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/20 Group, R8C/21 Group
Rev.2.00 Aug 27, 2008
REJ09B0250-0200
15. Serial Interface
Serial Interface is configured with two channels: UART0 and UART1. Each UART0 and Uart1 has an exclusive timer
to generate a transfer clock and they operate independently.
Figure 15.1 shows the UARTi (i = 0 or 1) Block Diagram. Figure 15.2 shows the UARTi (i = 0 or 1) Transmit/Receive
Unit.
UART0 has two modes: clock synchronous serial I/O mode, and clock asynchronous serial I/O mode (UART mode).
UART1 has only one mode: clock asynchronous serial interface mode (UART mode).
Figures 15.3 to 15.6 show the Registers Associated with UARTi.
Figure 15.1
(UART0)
(UART1)
RXD0
RXD1
CLK0
CLK1 to CLK0
CLK1 to CLK0
f32
f32
f1
f1
f8
f8
reversing
= 00b
= 01b
= 10b
= 00b
= 01b
= 10b
polarity
circuit
CLK
UARTi (i = 0 or 1) Block Diagram
U1PINSEL
Internal
Clock synchronous type
(when internal clock is selected)
CKDIR = 0
Internal
External
CKDIR = 1
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U0BRG register
U1BRG register
1/(n1 + 1)
1/(n0 + 1)
1/16
1/16
1/16
1/16
1/2
Clock synchronous type
(when internal clock is selected)
Clock synchronous type
(when external clock is selected)
UART reception
UART transmission
UART reception
UART transmission
synchronous type
synchronous type
Clock
Clock
Reception control
Reception control
Transmission
control circuit
Transmission
control circuit
CKDIR = 0
CKDIR = 1
circuit
circuit
Receive
clock
Receive
clock
Transmit
clock
Transmit
clock
Transmit/
Transmit/
receive
receive
unit
unit
15. Serial Interface
TXD0
TXD1