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Chapter 15
Asynchronous Serial Interface C (UARTC)
User’s Manual U16580EE3V1UD00
(8)
UARTCn receive data register (UCnRX, UCnRXL)
The UCnRX register is a 16-bit buffer register that stores parallel data converted by receive shift
register. It is overlayed by an 8-bit register UCnRXL on the lower 8 bits, which stores the lower
byte of the received data.
The data stored in the receive shift register is transferred to the UCnRX register upon completion
of reception of one data frame.
When extension bit operation is enabled (UCnEBE bit of UCnOPT1 register = 1) the 9th data bit is
received in bit 8 of the UCnRX register. When the extension bit operation is disabled (UCnEBE
bit = 0) the data bits are received in the lower byte of the UCnRX register. The lower byte can be
read also by 8-bit access of the UCnRXL register.
During LSB-first reception when the data length has been specified as 7 bits and th extension bit
operation is disabled, the receive data is transferred to bits 6 to 0 of the UXnRXL register and the
MSB always becomes 0. During MSB-first reception, the receive data is transferred to bits 7 to 1 of
the UCnRXL register and the LSB always becomes 0.
When an overrun error (UCnOVE bit = 1) occurs, the receive data at this time is not transferred to
the UCnRX and UXnRXL register respectively.
The UCnRX register is read-only, in 16-bit units.
The UCnRXL register is read-only, in 8-bit units.
In addition to reset input, the UCnRX register can be set to 1FFH, and the UCnRXL register can
be set to FFH respectively, by clearing the UCnPWR bit of the UCnCTL0 register to 0.
Figure 15-9:
UARTCn Receive Data Register (UCnRX, UCnRXL)
After reset:
1FFH
R
Address:
UC0RX FFFFFA06H,
UC1RX FFFFFA26H
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
UCnRX
0
0
0
0
0
0
0
(n = 0, 1)
UCnRXL
After reset:
FFH
R
Address:
UC0RXL FFFFFA06H,
UC1RXL FFFFFA26H
7
6
5
4
3
2
1
0
UCnRXL
(n = 0, 1)
Содержание MuPD70F3187
Страница 6: ...6 Preface User s Manual U16580EE3V1UD00 ...
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Страница 84: ...84 Chapter 2 Pin Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 144: ...144 Chapter 3 CPU Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 192: ...192 Chapter 5 Memory Access Control Function μPD70F3187 only User s Manual U16580EE3V1UD00 MEMO ...
Страница 312: ...312 Chapter 9 16 Bit Timer Event Counter P User s Manual U16580EE3V1UD00 MEMO ...
Страница 534: ...534 Chapter 11 16 bit Timer Event Counter T User s Manual U16580EE3V1UD00 ...
Страница 969: ...969 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 MEMO ...
Страница 970: ...970 Chapter 20 Port Functions User s Manual U16580EE3V1UD00 ...
Страница 976: ...976 Chapter 22 Internal RAM Parity Check Function User s Manual U16580EE3V1UD00 MEMO ...
Страница 984: ...984 Chapter 23 On Chip Debug Function OCD User s Manual U16580EE3V1UD00 MEMO ...
Страница 1006: ...1006 Chapter 24 Flash Memory User s Manual U16580EE3V1UD00 MEMO ...
Страница 1036: ...1036 Chapter 27 Recommended Soldering Conditions User s Manual U16580EE3V1UD00 MEMO ...
Страница 1046: ...1046 Appendix A Index User s Manual U16580EE3V1UD00 MEMO ...
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