R8C27 Datasheet, PDF (264/485 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES

R8C/26 Group, R8C/27 Group
15. Serial Interface
Pin Select Register 1
b7 b6 b5 b4 b3 b2 b1 b0
000001
Symbol
Address
After Reset
PINSR1
00F5h
00h
Bit Symbol
Bit Name
Function
RW
TXD1/RXD1 pin select bit⁽¹⁾
b1 b0
UART1SEL0
0 0 : P3_7(TXD1/RXD1)
RW
0 1 : P3_7(TXD1), P4_5(RXD1)
1 0 : P3_6(TXD1/RXD1)
UART1SEL1
1 1 : Do not set.
RW
—
Reserved bit
(b2)
Set to 1. When read, the content is 0.
RW
—
(b7-b3)
Reserved bits
Set to 0. When read, the content is 0.
RW
NOTE:
1. The UART1 pins can be selected by using bits U1PINSEL, TXD1SEL and TXD1EN in the PMR register.
Port Mode Register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
Address
After Reset
PMR
00F8h
00h
Bit Symbol
Bit Name
Function
RW
_____
INT1SEL ^{INT1 pin select bit}
0 : P1_5, P1_7
1 : P3_6
RW
—
Nothing is assigned. If necessary, set to 0.
(b2-b1) When read, the content is 0.
—
SSI pin select bit
0 : P3_3
SSISEL
1 : P1_6
RW
TXD1 pin sw itch bit⁽¹⁾
0 : P0_0
U1PINSEL
1 : P3_6, P3_7
RW
Port/TXD1 pin sw itch bit⁽¹⁾
0 : Programmable I/O port
TXD1SEL
1 : TXD1
RW
TXD1/RXD1 select bit⁽¹⁾
0 : RXD1
TXD1EN
1 : TXD1
RW
SSU / I²C bus pin sw itch bit
0 : Selects SSU function
IICSEL
1 : Selects I²C bus function
RW
NOTE:
1. The UART1 pins can be selected by using bits U1PINSEL, TXD1SEL and TXD1EN, and bits UART1SEL1 and
UART1SEL0 in the PINSR1 register.
PINSR1 Register
UART1SEL1,
UART1SEL0 bit
00b
01b
10b
×: 0 or 1
Pin Function
P3_7(TXD1)
P3_7(RXD1)
P0_0(TXD1)
P3_7(TXD1)
P4_5(RXD1)
P3_6(TXD1)
P3_6(RXD1)
P0_0(TXD1)
PMR Register
U1PINSEL bit TXD1SEL bit TXD1EN bit
1
×
×
0
0
1
×
1
1
×
×
1
×
×
0
0
1
×
Figure 15.7 Registers PINSR1 and PMR
Rev.2.10 Sep 26, 2008 Page 247 of 453
REJ09B0278-0210