R8C/20 Group, R8C/21 Group 15. Serial Interface
Rev.2.00 Aug 27, 2008 Page 267 of 458
REJ09B0250-0200
Figure 15.3 Registers UiTB, UiRB, and UiBRG (i = 0 or 1)
UARTi Transmit Buffer Register (i = 0 or 1)
(1,2)
Symbol Address After Reset
U0TB
00A3h-00A2h Indeterminate
U1TB
00ABh-00AAh Indeterminate
RW
NOTES:
1.
2.
(b15)
b7
(b8)
b0 b0b7
Use the MOV instruction to w rite to this register.
WO
—
Nothing is assigned. If necessary, set to 0.
When read, the content is indeterminate.
—
(b15-b9)
When the transfer data length is 9-bit long, w rite to high-byte data first then low -byte data.
FunctionBit Symbol
—
(b8-b0)
Transmit data
UARTi Receive Buffer Register (i = 0 or 1)
(1)
Symbol After Reset
U0RB
Indeterminate
U1RB
Indeterminate
RW
NOTES:
1.
2.
—
—
(b7-b0)
—
Function
Receive data (D7 to D0)
RO
Receive data (D8)
RO
—
(b8)
—
b0b7
(b15)
b7
(b8)
b0
Bit Symbol Bit Name
Address
00A7h-00A6h
00AFh-00AEh
OER
Overrun error flag
(2)
0 : No overrun error
1 : Overrun error
RO
0 : No parity error
1 : Parity error
RO
FER
Framing error flag
(2)
0 : No framing error
1 : Framing error
RO
Nothing is assigned. If necessary, set to 0.
When read, the content is indeterminate.
—
(b11-b9)
Read out the UiRB register in 16-bit unit.
The SUM, PER, FER and OER bits are set to 0 (no error) w hen the SMD2 to SMD0 bits in the UiMR register are set to
000b (serial interface disabled) or the RE bit in the U0C1 register is set to 0 (receive disable). The SUM bit is set to 0
(no error) w hen the PER, FER and OER bits are set to 0 (no error). Also, the PER and FER bits are set to 0 w hen the
higher byte of the UiRB register is read out.
ROSUM
Error sum flag
(2)
0 : No error
1 : Error
PER
Parity error flag
(2)
UARTi Bit Rate Register (i = 0 or 1)
(1,2,3)
Symbol Address After Reset
U0BRG
00A1h Indeterminate
U1BRG
00A9h Indeterminate
Setting Range RW
NOTES:
1.
2.
3.
b7
Assuming that set value is n, UiBRG divides the count source by
n+1
b0
After setting the CLK0 to CLK1 bits in the UiC0 register, w rite to the UiBRG register.
Use the MOV instruction to w rite to this register.
WO
Write to this register w hile the serial interface is neither transmitting nor receiving.
00h to FFh
Function
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