r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 506

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 23.9
23.4.2
23.4.3
If communication is aborted or a communication error occurs while transmitting or receiving in UART 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 100b (UART mode, transfer data 7 bits long), 101b
(4) Set the TE bit in the U2C1 register to 1 (transmission enabled) and the RE bit to 1 (reception enabled).
As shown in Figure 23.9, use the UFORM bit in the U2C0 register to select the transfer format. This function is
enabled when transfer data is 8 bits long. Figure 23.9 shows the Transfer Format.
(UART mode, transfer data 8 bits long), or 110b (UART mode, transfer data 9 bits long).
Measure for Dealing with Communication Errors
LSB First/MSB First Select Function
(1) UFORM Bit in U2C0 Register = 0 (LSB first)
(2) UFORM Bit in U2C0 Register = 1 (MSB first)
Transfer Format
The above applies when:
CLK2
TXD2
RXD2
CLK2
TXD2
RXD2
• CKPOL bit in U2C0 register = 0 (transmit data output at the falling edge and
• U2LCH bit in U2C1 register = 0 (not inverted)
• STPS bit in U2MR register = 0 (one stop bit)
• PRYE bit in U2MR register = 1 (parity enabled)
receive data input at the rising edge of the transfer clock)
ST
ST
ST
ST
D0
D0
D7
D7
D1
D1
D6
D6
D2
D2
D5
D5
D3
D3
D4
D4
D4
D4
D3
D3
D5
D5
D2
D2
D6
D6
D1
D1
D7
D7
D0
D0
ST: Start bit
P: Parity bit
SP: Stop bit
P
P
P
P
23. Serial Interface (UART2)
SP
SP
SP
SP
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