r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 503

• 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
Table 23.7
TXD2
(P3_4, P3_7,
or P6_6)
RXD2
(P3_4, P3_7,
or P4_5)
CLK2
(P3_5 or P6_5)
CTS2/RTS2
(P3_3)
Table 23.7 lists the I/O Pin Functions in UART Mode.
Note that for a period from when the UART2 operating mode is selected to when transfer starts, the TXD2 pin
outputs “H”. (When N-channel open-drain output is selected, this pin is in the high-impedance state.)
Figure 23.7 shows the Transmit Timing in UART Mode. Figure 23.8 shows the Receive Timing in UART Mode.
Pin Name
I/O Pin Functions in UART Mode
Serial data output
Serial data input
I/O port
Transfer clock input
CTS input
RTS output
I/O port
Function
• TXD2 (P3_4)
• TXD2 (P3_7)
• TXD2 (P6_6)
• For reception only:
• RXD2 (P3_4)
• RXD2 (P3_7)
• RXD2 (P4_5)
• For transmission only:
Bits CLK2SEL1 to CLK2SEL0 in U2SR1 register = 00b
• CLK2 (P3_5)
• CLK2 (P6_5)
CTS2SEL0 bit in U2SR1 register = 1
CRD bit in U2C0 register = 0
CRS bit in U2C0 register = 0
PD3_3 bit in PD3 register = 0
CTS2SEL0 bit in U2SR1 register = 1
CRD bit in U2C0 register = 0
CRS bit in U2C0 register = 1
CTS2SEL0 bit in U2SR1 register = 0
Bits TXD2SEL2 to TXD2SEL0 in U2SR0 register = 010b (P3_4)
Bits TXD2SEL2 to TXD2SEL0 in U2SR0 register = 001b (P3_7)
Bits TXD2SEL2 to TXD2SEL0 in U2SR0 register = 101b (P6_6)
P3_4, P3_7, and P6_6 can be used as ports by setting
TXD2SEL2 to TXD2SEL0 to 000b.
Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 01b (P3_4)
PD3_4 bit in PD3 register =0
Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 10b (P3_7)
PD3_7 bit in PD3 register = 0
Bits RXD2SEL1 to RXD2SEL0 in U2SR0 register = 11b (P4_5)
PD4_5 bit in PD4 register = 0
P3_4, P3_7, and P4_5 can be used as ports by setting
RXD2SEL1 to RXD2SEL0 to 00b.
Bits CLK2SEL1 to CLK2SEL0 in U2SR1 register = 01b (P3_5)
CKDIR bit in U2MR register = 1
PD3_5 bit in PD3 register = 0
Bits CLK2SEL1 to CLK2SEL0 in U2SR1 register = 11b (P6_5)
CKDIR bit in U2MR register = 1
PD6_5 bit in PD6 register = 0
Selection Method
23. Serial Interface (UART2)
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