r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 452

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
Figure 20.12
20.3.2.5
20.3.2.6
This function inverts the polarities of the TXD2 pin output and RXD2 pin input. The logic levels of all I/O data
(including bits for start, stop, and parity) are inverted. Figure 20.12 shows the TXD and RXD I/O Polarity
Inversion.
The CTS function is used to start transmit and receive operations when a low level is applied to the CTS2 pin.
Transmit and receive operations start when the CTS2 pin is held low. If the input level is switched to high
during a transmit or receive operation, the operation stops before the next data.
For the RTS function, the RTS2 pin outputs a low level when the MCU is ready for a receive operation. The
output level goes high at the first falling edge of the RXD2 pin.
• CRD bit in the U2C0 register = 1 (CTS/RTS function disabled):
• CRD bit = 0 and CRS bit = 0 (CTS function selected):
• CRD bit = 0 and CRS bit = 1 (RTS function selected):
CTS2 pin input is unused, and RTS2 pin output is high
CTS2 pin input is active, and RTS2 pin output is high
CTS2 pin input is unused, and RTS2 pin output is active
(1) IOPOL Bit in U2MR Register = 0 (not inverted)
(2) IOPOL Bit in U2MR Register = 1 (inverted)
The above applies under the following conditions:
• UFORM bit in U2C0 register = 0 (LSB first)
• STPS bit in U2MR register = 0 (one stop bit)
• PRYE bit in U2MR register = 1 (parity enabled)
Transfer clock
Transfer clock
(not inverted)
(not inverted)
Preliminary document
Specifications in this document are tentative and subject to change.
TXD and RXD I/O Polarity Inverse Function
TXD and RXD I/O Polarity Inversion
CTS/RTS Function
(inverted)
(inverted)
RXD2
RXD2
TXD2
TXD2
ST
ST
ST
ST
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
ST: Start bit
P: Parity bit
SP: Stop bit
D7
D7
D7
D7
20. Serial Interface (UART2)
P
P
P
P
SP
SP
SP
SP
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