M32C8B Datasheet, PDF (223/406 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 SERIES

Under development ^{Preliminary specification}
Specifications in this manual are tentative and subject to change.
M32C/8B Group
17. Serial Interfaces
UARTi Transmit Buffer Register ⁽¹⁾ (i = 0 to 4)
b15
b8 b7
b0
Symbol
U0TB to U2TB
U3TB, U4TB
Address
036Bh - 036Ah, 02EBh - 02EAh, 033Bh - 033Ah
032Bh - 032Ah, 02FBh - 02FAh
After Reset
Undefined
Undefined
Bit Symbol
Function
RW
−
(b7-b0)
Transmit data (D7 to D0)
WO
−
(b8)
Transmit data (D8)
WO
−
(b15-b9)
Unimplemented.
Write 0. Read as undefined value.
−
NOTE:
1. Read-modify-write instructions cannot be used to set the UiTB register. Refer to Usage Notes for details.
UARTi Receive Buffer Register (i = 0 to 4)
b15
b8 b7
b0
Symbol
U0RB to U2RB
U3RB, U4RB
Address
036Fh - 036Eh, 02EFh - 02EEh, 033Fh - 033Eh
032Fh - 032Eh, 02FFh - 02FEh
After Reset
Undefined
Undefined
Bit Symbol
Bit Name
Function
RW
−
(b7-b0)
−
Received data (D7 to D0)
RO
−
(b8)
−
Received data (D8)
RO
−
(b10-b9)
Unimplemented.
Write 0. Read as undefined value.
−
ABT
Arbitration lost detect flag⁽¹⁾
0: Not detected (won)
1: Detected (lost)
RW
OER
Overrun error flag⁽²⁾
0: No overrun error
1: Overrun error
RO
FER
Framing error flag^{(2, 3)}
0: No framing error
1: Framing error
RO
PER
Parity error flag^{(2, 3)}
0: No parity error
1: Parity error
RO
SUM
Error sum flag^{(2, 3)}
0 No error occurred
1: Error occurred
RO
NOTES:
1. Only a 0 can be written to the ABT bit.
2. When bits SMD2 to SMD0 in the UiMR register are set to 000b (serial interface disabled) or the RE bit in the UiC1 register is set to
0 (receive operation disabled), bits OER, FER, PER and SUM become 0.
When all of bits OER, FER and PER become 0, the SUM bit also becomes 0.
Bits FER and PER become 0 by reading the low-order byte in the UiRB register.
3. Bits FER, PER and SUM are disabled when bits SMD2 to SMD0 in the UiMR register are set to 001b (clock synchronous mode)
or 010b (I²C mode). A read from these bits returns undefined value.
Figure 17.10 U0TB to U4TB Registers, U0RB to U4RB Registers
REJ09B0450-0050 Rev.0.50 Oct 31, 2008
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