em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 23

• Manufacturer Part Number: em78p809n
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
URRD7
URRD8
Bit 7
Bit 7
URS − UART Status Register ( Address: 07h )
Bit 7 ( URRD8 ) : Receiving data bit 8
Bit 6 ( EVEN ) : Select parity check
Bit 5 ( PRE ) : Enable parity addition
Bit 4 ( PRERR ) : Parity error flag.
Bit 3 ( OVERR ) : Overrun error flag.
Bit 2 ( FMERR ) : Framing error flag.
Bit 1 ( URBF ) : UART read buffer full flag.
Bit 0 ( RXE ) : Enable receiving
URRD − UART Receive Data Buffer ( Address: 08h )
Bit 7 ~ Bit 0 ( URRD7 ~ URRD0 ) : UART receive data buffer. Read only.
Set to 1 when one character is received. Reset to 0 automatically when read
from the URS register. URBF will be cleared by hardware when receiving is
enabled. URBF bit is read-only. Therefore, reading the URS register is
necessary to avoid an overrun error.
EVEN = “0” : Odd parity
EVEN = “1” : Even parity
PRE = “0” : Disable
PRE = “1” : Enable
Set to 1 when framing error occurred, and cleared to 0 by software.
RXE = “0” : Disable
RXE = “1” : Enable
Set to 1 when parity error occurred, and cleared to 0 by software.
Set to 1 when overrun error occurred, and cleared to 0 by software.
URRD6
EVEN
Bit 6
Bit 6
URRD5
Bit 5
Bit 5
PRE
URRD4
PRERR
Bit 4
Bit 4
URRD3
OVERR
Bit 3
Bit 3
URRD2
FMERR
Bit 2
Bit 2
8-Bit Microcontroller
URRD1
URBF
Bit 1
Bit 1
EM78P809N
URRD0
Bit 0
Bit 0
RXE
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