R8C/18 Group, R8C/19 Group
15. Serial Interface
Rev.1.30
Apr 14, 2006
Page 151 of 233
REJ09B0222-0130
Figure 15.6
Registers U0C1 to U1C1, and UCON
UART Transmit/Receive Control Register 2
Symbol
Address
Af ter Reset
UCON
00B0h
00h
Bit Symbol
Bit Name
Function
RW
0 : P1_5/RXD0
P1_7/CNTR00/INT10
______
1 : P1_5/RXD0/CNTR01/INT11
______
P1_7
NOTE:
1. The CNTRSEL bit selects the input pin of the CNTR0 (INTI
____
) signal.
When the CNTR0 signal is output, it is output f rom the CNTR00 pin regardless of the CNTRSEL bit setting.
Reserved bit
Set to 0.
RW
RW
CNTRSEL
U1SEL1
RW
—
(b6)
b7 b6 b5 b4
0
RW
U0IRS
UART0 transmit interrupt
source select bit
0 : Transmit buf f er empty (TI = 1)
1 : Transmit completed (TXEPT = 1)
RW
U1IRS
RW
UART0 continuous receive
mode enable bit
0 : Disables continuous receive mode.
1 : Enables continuous receive mode.
UART1 transmit interrupt
source select bit
0 : Transmit buf f er empty (TI = 1)
1 : Transmit completed (TXEPT = 1)
b3 b2
—
(b3)
b1 b0
0
U0RRM
CNTR0 signal pin select bit
(1)
U1SEL0
RW
UART1 pin (P3_7/TXD1,
P4_5/RXD1) select bits
b5 b4
0 0 : P3_7, P4_5
0 1 : P3_7, RXD1
1 0 : Do not set.
1 1 : TXD1, RXD1
Reserved bit
Set to 0.
RW
UARTi Transmit/Receive Control Register 1 (i = 0 or 1)
Symbol
Address
After Reset
U0C1
00A5h
02h
U1C1
00ADh
02h
Bit Symbol
Bit Name
Function
RW
NOTE:
1.
RO
RW
RI
Receive complete flag
(1)
0 : No data in UiRB register
1 : Data in UiRB register
The RI bit is set to 0 w hen the higher byte of the UiRB register is read out. Set the PD1_6 bit in the PD1 register to 0
(input).
RW
TI
RO
0 : Data in UiTB register
1 : No data in UiTB register
TE
RE
—
(b7-b4)
—
Receive enable bit
b7 b6 b5 b4 b3 b2 b1 b0
Nothing is assigned. If necessary, set to 0.
When read, the content is 0.
Transmit enable bit
0 : Disables transmission.
1 : Enables transmission.
Transmit buffer empty flag
0 : Disables reception.
1 : Enables reception.
