R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 303

• Manufacturer Part Number: R5F21238DFP#U0
• Description: IC R8C/23 MCU FLASH 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/23r

Specifications of R5F21238DFP#U0

• Core Size: 16/32-Bit
• Program Memory Size: 64KB (64K x 8)
• Peripherals: POR, Voltage Detect, WDT
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: CAN, I²C, LIN, SIO, SSU, UART/USART
• Number Of I /o: 41
• Program Memory Type: FLASH
• Ram Size: 3K 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
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Embedded Interface Type: CAN, I2C, UART
• Rohs Compliant: Yes
• Cpu Family: R8C
• Device Core Size: 16b
• Frequency (max): 20MHz
• Interface Type: I2C/UART
• Total Internal Ram Size: 3KB
• # I/os (max): 41
• Number Of Timers - General Purpose: 5
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 12-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0K521237S000BE - KIT DEV RSK R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
15.1
Table 15.1
NOTES:
Transfer Data Format
Transfer Clocks
Transmit Start Conditions
Receive Start Conditions
Interrupt Request
Generation Timing
Error Detection
Select Functions
The clock synchronous serial I/O mode is mode to transmit and receive data using a transfer clock. This mode is
selected in UART0 only.
Table 15.1 lists the Clock Synchronous Serial I/O Mode Specifications. Table 15.2 lists the Registers Used and
Settings in Clock Synchronous Serial I/O Mode
1. When an external clock is selected, meet the conditions while the CKPOL bit in the U0C0 register is
2. If an overrun error occurs, the receive data (b0 to b8) of the U0RB register will be undefined. The IR
set to 0 (transmit data output at the falling edge and the receive data input at the rising edge of the
transfer clock), the external clock is held “H”; if the CKPOL bit in the U0C0 register is set to 1
(transmit data output at the rising edge and the receive data input at the falling edge of the transfer
clock), the external clock is held “L”.
bit in the S0RIC register remains unchanged.
Clock Synchronous Serial I/O Mode
Item
Clock Synchronous Serial I/O Mode Specifications
Page 281 of 501
• Transfer data length: 8 bits
• CKDIR bit in U0MR register is set to 0 (internal clock): fi/(2(n + 1))
• The CKDIR bit is set to 1 (external clock): input from CLK0 pin
• Before transmit starts, the following requirements are required
• Before receive starts, the following requirements are required
• When transmit, one of the following conditions can be selected
• When receive
• Overrun error
• CLK polarity selection
• LSB first, MSB first selection
• Continuous receive mode selection
fi = f1, f8, f32 n = setting value in U0BRG register: 00h to FFh
- The TE bit in the U0C1 register is set to 1 (transmit enabled)
- The TI bit in the U0C1 register is set to 0 (data in the U0TB register)
- The RE bit in the U0C1 register is set to 1 (receive enabled)
- The TE bit in the U0C1 register is set to 1 (transmit enabled)
- The TI bit in the U0C1 register is set to 0 (data in the U0TB register)
- The U0IRS bit is set to 0 (transmit buffer empty):
- The U0IRS bit is set to 1 (transmit completes):
When transferring data from the UART0 receive register to the U0RB
register (when receive completes)
This error occurs if serial interface starts receiving the following data before
reading the U0RB register and receives the 7th bit of the following data
Transfer data input/output can be selected to occur synchronously with the
rising or the falling edge of the transfer clock
Whether transmitting or receiving data beginning with the bit 0 or beginning
with the bit 7 can be selected
Receive is enabled immediately by reading the U0RB register
when transferring data from the U0TB register to UART0 transmit register
(when transmit starts)
when completing transmit data from UARTi transmit register
(2)
(1)
.
Specification
15. Serial Interface
(1)
(1)