M16C30P_07 Datasheet, PDF (139/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
15. Serial Interface
UARTi Transmit Buffer Register (i=0 to 2)⁽¹⁾
(b15)
(b8)
b7
b0 b7
b0
Symbol
U0TB
U1TB
U2TB
Address
03A3h to 03A2h
03ABh to 03AAh
037Bh to 037Ah
Function
Transmit data
Nothing is assigned. When w rite, set to “0”.
When read, their contents are indeterminate.
NOTES :
1. Use MOV instruction to w rite to this register.
After Reset
Indeterminate
Indeterminate
Indeterminate
RW
WO
—
UARTi Receive Buffer Register (i=0 to 2)
(b15)
(b8)
b7
b0 b7
b0
Bit
Symbol
—
—
(b7-b0)
Symbol
U0RB
U1RB
U2RB
Bit Name
Address
03A7h to 03A6h
03AFh to 03AEh
037Fh to 037Eh
After Reset
Indeterminate
Indeterminate
Indeterminate
Function
RW
Receive data (D7 to D0)
RO
—
—
Receive data (D8)
(b8)
RO
—
Nothing is assigned. When w rite, set to “0”.
(b10-b9) When read, their contents are “0”.
—
Arbitration Lost Detecting 0 : Not detected
ABT
Flag ⁽²⁾
1 : Detected
RW
Overrun Error Flag ⁽¹⁾
0 : No overrun error
OER
1 : Overrun error found
RO
Framing Error Flag ^{(1, 3)}
0 : No framing error
FER
1 : Framing error found
RO
Parity Error Flag ^{(1, 3)}
0 : No parity error
PER
1 : Parity error found
RO
Error Sum Flag ^(1,3)
0 : No error
SUM
1 : Error found
RO
NOTES :
1. When the SMD2 to SMD0 bits in the UiMR register = 000b (serial interface disabled) or the RE bit in the UiC1 register =
0 (reception disabled), all of the SUM, PER, FER and OER bits are set to “0” (no error). The SUM bit is set to “0” (no
error) w hen all of the PER, FER and OER bits = 0 (no error).
Also, the PER and FER bits are set to “0” by reading the low er byte of the UiRB register.
2. The ABT bit is set to “0” by w riting “0” in a program. (Writing “1” has no effect)
3. These error flags are disabled w hen the SMD2 to SMD0 bits are set to “001b” (clock synchronous serial
I/O mode) or to “010b” (I²C mode). When read, the contents are indeterminate.
Figure 15.5 UiTB and UiRB Registers
Rev.1.22 Mar 29, 2007 Page 123 of 291
REJ09B0179-0122