M16C65 Datasheet, PDF (531/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
23. Serial Interface UARTi (i = 0 to 2, 5 to 7)
23.2.4 UARTi Receive Buffer Register (UiRB) (i = 0 to 2, 5 to 7)
UARTi Receive Buffer Register (i = 0 to 2, 5 to 7)
(b15) (b8)
b7
b0 b7
b0
Symbol
U0RB
U1RB
U2RB
U5RB
U6RB
U7RB
Address
024Fh to 024Eh
025Fh to 025Eh
026Fh to 026Eh
028Fh to 028Eh
029Fh to 029Eh
02AFh to 02AEh
Bit Symbol
Bit Name
Function
—
(b7-b0)
Receive data (D7 to D0)
—
(b8)
Receive data (D8)
—
(b10-b9)
No register bits. If necessary, set to 0. Read as undefined value
ABT
Arbitration lost detect flag
0 : Not detected
1 : Detected
OER Overrun error flag
0 : No overrun error
1 : Overrun error found
FER Framing error flag
0 : No framing error
1 : Framing error found
PER Parity error flag
0 : No parity error
1 : Parity error found
SUM Error sum flag
0 : No error
1 : Error found
After Reset
Undefined
Undefined
Undefined
Undefined
Undefined
Undefined
RW
RO
RO
—
RW
RO
RO
RO
RO
When bits SMD2 to SMD0 in the UiMR register is 100b, 101b or 110b, read in 16-bit units, or read in 8-
bit units in the order of high-order bytes to low-order bytes.
Bits FER and PER arranged in the high-order bytes become 0 when the lower bytes of the UiRB
register are read.
If an overrun error occurs, the receive data of the UiRB register will be undefined.
ABT (Arbitration Lost Detect Flag) (b11)
The ABT bit is set to 0 by a program. (It remains unchanged even if 1 is written.)
OER (Overrun Error Flag) (b12)
Condition to become 0:
• Bits SMD2 to SMD0 in the UiMR register are 000b (serial interface disabled).
• The RE bit in the UiC1 register is 0 (reception disabled).
Condition to become 1:
• The RI bit in the UiC1 register is 1 (data present in UiRB register), and the last bit of the next data
is received.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 496 of 791