r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 477

• 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 22.7
TXD0 (P1_4)
RXD0 (P1_5)
CLK0 (P1_6)
TXD1 (P0_1 or
P6_3)
RXD1 (P0_2 or
P6_4)
CLK1 (P0_3,
P6_2, or P6_5)
Table 22.7 lists the I/O Pin Functions in UART Mode.
After the UARTi (i = 0 to 1) operating mode is selected, the TXDi pin outputs a “H” level until transfer starts. (If
the NCH bit is set to 1 (N-channel open-drain output), this pin is in the high-impedance state.)
Pin name
I/O Pin Functions in UART Mode
Serial data output
Serial data input
Programmable I/O port CLK0SEL0 bit in U0SR register = 0 (CLK0 pin not used)
Transfer clock input
Serial data output
Serial data input
Programmable I/O port Bits CLK1SEL1 to CLK1SEL0 in U1SR register = 00b
Transfer clock input
Function
TXD0SEL0 bit in U0SR register = 1
For reception only:
P1_4 can be used as a port by setting TXD0SEL0 bit = 0.
RXD0SEL0 bit in U0SR register = 1
PD1_5 bit in PD1 register = 0
For transmission only:
P1_5 can be used as a port by setting RXD0SEL0 bit = 0.
CLK0SEL0 bit in U0SR register = 1
CKDIR bit in U0MR register = 1
PD1_6 bit in PD1 register = 0
• TXD1 (P0_1)
• TXD1 (P6_3)
• For reception only:
• RXD1 (P0_2)
• RXD1 (P6_4)
• For transmission only:
(CLK1 pin not used)
• CLK1 (P0_3)
• CLK1 (P6_2)
• CLK1 (P6_5)
Bits TXD1SEL1 to TXD1SEL0 in U1SR register = 01b (P0_1)
Bits TXD1SEL1 to TXD1SEL0 in U1SR register = 10b (P6_3)
P0_1 and P6_3 can be used as a port by setting bits
TXD1SEL1 to TXD1SEL0 = 00b.
Bits RXD1SEL1 to RXD1SEL0 in U1SR register = 01b (P0_2)
PD0_2 bit in PD0 register = 0
Bits RXD1SEL1 to RXD1SEL0 in U1SR register = 10b (P6_4)
PD6_4 bit in PD6 register = 0
P0_2 and P6_4 can be used as a port by setting bits
RXD1SEL1 to RXD1SEL0 = 00b.
Bits CLK1SEL1 to CLK1SEL0 in U1SR register = 01b (P0_3)
CKDIR bit in U1MR register = 1
PD0_3 bit in PD0 register = 0
Bits CLK1SEL1 to CLK1SEL0 in U1SR register = 10b (P6_2)
CKDIR bit in U1MR register = 1
PD6_2 bit in PD6 register = 0
Bits CLK1SEL1 to CLK1SEL0 in U1SR register = 11b (P6_5)
CKDIR bit in U1MR register = 1
PD6_5 bit in PD6 register = 0
Selection Method
22. Serial Interface (UARTi (i = 0 or 1))
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