R8C/20 Group, R8C/21 Group 15. Serial Interface
Rev.2.00 Aug 27, 2008 Page 269 of 458
REJ09B0250-0200
Figure 15.5 Registers UiC0 and UiC1 (i = 0 or 1)
UARTi Transmit/Receive Control Register 0 (i = 0 or 1)
Symbol Address After Reset
U0C0
00A4h 00001000b
U1C0
00ACh 00001000b
Bit Symbol Bit Name Function RW
NOTE:
1.
RW
RW
If the BRG count source is sw itched, set the UiBRG register again.
RW
Data output select bit 0 : TXDi pin is a pin of CMOS output
1 : TXDi pin is a pin of N-channel open drain output
UFORM
Transfer format select bit 0 : LSB first
1 : MSB first
NCH
CLK polarity select bit 0 : Transmit data is output at falling edge of transfer
clock and receive data is input at rising edge
1 : Transmit data is output at rising edge of transfer
clock and receive data is input at falling edge
Set to 0
Transmit register empty
flag
0 : Data in transmit register (during transmit)
1 : No data in transmit register (transmit completed)
Nothing is assigned. If necessary, set to 0.
When read, the content is 0.
—
(b2)
CKPOL
CLK1 RW
BRG count source select
bit
(1)
b1 b0
0 0 : Selects f1
0 1 : Selects f8
1 0 : Selects f32
1 1 : Do not set
RW
RW
RO
—
(b4)
—
Reserved bit
b7 b6 b5 b4 b3 b2
TXEPT
b1 b0
0
CLK0
UARTi Transmit/Receive Control Register 1 (i = 0 or 1)
Symbol Address After Reset
U0C1 00A5h 00000010b
U1C1 00ADh 00000010b
Bit Symbol Bit Name Function RW
NOTES:
1.
2. Set the UiRRM bit to 0 (disables continuous receive mode) in UART mode.
RW
RW
UiRRM
UARTi continuous receive mode
enable bit
(2)
RI
Receive complete flag
(1)
0 : No data in UiRB register
1 : Data in UiRB register
RO
UiIRS
The RI bit is set to 0 w hen the higher byte of the UiRB register is read out.
RW
TI RO
0 : Data in UiTB register
1 : No data in UiTB register
TE
RE
—
(b7-b6)
—
b7 b6 b5 b4
Nothing is assigned. If necessary, set to 0.
When read, the content is 0.
Transmit enable bit 0 : Disables transmit
1 : Enables transmit
Transmit buffer empty flag
0 : Disables receive
1 : Enables receive
0 : Disables continuous receive mode
1 : Enables continuous receive mode
0 : Transmit buffer empty (TI = 1)
1 : Transmit completed (TXEPT = 1)
Receive enable bit
RW
b3 b2 b1 b0
UARTi transmit interrupt cause
select bit
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