
R8C/14 Group, R8C/15 Group 14. Serial Interface
Rev.2.10 Jan 19, 2006 Page 129 of 253
REJ09B0164-0210
Figure 14.5 U0C1 and UCON Registers
UART0 Transmit / Receive Control Register 1
Symbol Address After Reset
U0C1 00A5h 02h
Bit Symbol Bit Name Function RW
NOTES :
1.
RO
RW
RI
Receive Complete Flag
(1)
The RI bit is set to “0” when the higher byte of the U0RB register is read out.
RW
TI RO
0 : Data in U0TB register
1 : No data in U0TB register
TE
RE
—
(b7-b4)
—
Receive Enable Bit
b7 b6 b5 b4 b0
Nothing is assigned. When write, set to “0”.
When read, its content is “0”.
Transmit Enable Bit 0 : Disables transmit
1 : Enables transmit
Transmit Buffer Empty Flag
0 : Disables receive
1 : Enables receive
0 : No data in U0RB register
1 : Data in U0RB register
b3 b2 b1
UART Transmit / Receive Control Register 2
Symbol Address After 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
NOTES :
1. The CNTRSEL bit selects the input pin of CNTR0 (INTI
____
) signal.
When the CNTR0 signal is output, it is output from the CNTR00 pin despite the CNTRSEL bit setting.
Reserved Bit Set to “0”
CNTR0 Signal Pin Select Bit
(1)
RW
RWCNTRSEL
b7 b6 b5 b4
00
RW
0
U0IRS
0
UART0 Transmit Interrupt
Cause Select Bit
0 : Transmit buffer empty (TI=1)
1 : Transmit completed (TXEPT=1)
RW
—
(b1)
RW
UART0 Continuous Receive
Mode Enable Bit
0 : Disables continuous receive mode
1 : Enables continuous receive mode
Reserved Bit Set to “0”
b3 b2
—
(b6-b3)
b1 b0
0
U0RRM
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