EM78P809N
8-Bit Microcontroller
Bit 6 ~ Bit 5 ( UMODE1 ~ UMODE0 ) : UART Transmission Mode Select Bit
UMODE1
UMODE0
UART Mode
Mode1: 7-bits
Mode2: 8-bits
Mode3: 9-bits
Reserved
0
0
1
1
0
1
0
1
Bit 4 ~ Bit 2 ( BRATE2 ~ BRATE1 ) : Transmit Baud Rate Select
BRATE2
BRATE1
BRATE0
Baud Rate
e.g. Fc=8MHz
38400
19200
9600
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Fc/13
Fc/26
Fc/52
Fc/104
Fc/208
Fc/416
TC4
4800
2400
1200
Fc/96
Bit 1 ( UTBE ) : UART transfer buffer empty flag. Set to 1 when transfer buffer is
empty. Reset to 0 automatically when writing into the URTD register. UTBE bit will
be cleared by hardware when enabling the transmission. UTBE bit is read-only.
Therefore, writing to the URTD register is necessary when we want to start
transmission shifting.
Bit 0 ( TXE ) : Enable transmission
TXE = “0” : Disable
TXE = “1” : Enable
•
URC2 − UART Control Register 2 ( Address: 06h )
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
SBIM1
SBIM0
UINVEN
0
0
0
Bit 5 ~ Bit 4 ( SBIM1 ~ SBIM0 ) : Serial bus interface operation mode select.
TC2CK1
TC2CK0
Operation Mode
I/O mode
0
0
1
1
0
1
0
1
SPI mode
UART mode
Reserved
Bit 3 ( UINVEN ) : Enable UART TXD and RXD port inverse output.
UINVEN = “0” : Disable TXD and RXD port inverse output.
UINVEN = “1” : Enable TXD and RXD port inverse output.
18 •
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
