R5F21356CNFP#U0 Renesas Electronics America, R5F21356CNFP#U0 Datasheet - Page 506

• Manufacturer Part Number: R5F21356CNFP#U0
• Description: MCU 1KB FLASH 32K ROM 52-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/35Cr

Specifications of R5F21356CNFP#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: 47
• 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: 52-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/35C Group
REJ09B0567-0100 Rev.1.00 Dec. 14, 2009
Page 473 of 725
Figure 23.4
23.3.1
23.3.2
If communication is aborted or a communication error occurs while transmitting or receiving in clock
synchronous serial I/O mode, follow the procedures below:
(1) Set the TE bit in the U2C1 register to 0 (transmission disabled) and the RE bit to 0 (reception disabled).
(2) Set bits SMD2 to SMD0 in the U2MR register to 000b (serial interface disabled).
(3) Set bits SMD2 to SMD0 in the U2MR register to 001b (clock synchronous serial I/O mode).
(4) Set the TE bit in the U2C1 register to 1 (transmission enabled) and the RE bit to 1 (reception enabled).
Use the CKPOL bit in the U2C0 register to select the transfer clock polarity. Figure 23.4 shows the Transfer
Clock Polarity.
(1) CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and
(2) CKPOL bit in U2C0 register = 1 (transmit data output at the rising edge and
CLK2
TXD2
RXD2
CLK2
TXD2
RXD2
The above applies when:
Measure for Dealing with Communication Errors
CLK Polarity Select Function
•
•
receive data input at the rising edge of the transfer clock)
receive data input at the falling edge of the transfer clock)
UFORM bit in U2C0 register = 0 (LSB first)
U2LCH bit in U2C1 register = 0 (not inverted)
Transfer Clock Polarity
D0
D0
D0
D0
D1
D1
D1
D1
D2
D2
D2
D2
D3
D3
D3
D3
D4
D4
D4
D4
D5
D5
D5
D5
D6
D6
D6
D6
D7
D7
D7
D7
“H” output from CLK2 pin
“L” output from CLK2 pin
during no transfer
during no transfer
23. Serial Interface (UART2)