em78p809n ELAN Microelectronics Corp, em78p809n Datasheet - Page 22

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

EM78P809N
8-Bit Microcontroller
18 •
Bit 7
Bit 0 ( TXE ) : Enable transmission
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.
URC2 − UART Control Register 2 ( Address: 06h )
Bit 5 ~ Bit 4 ( SBIM1 ~ SBIM0 ) : Serial bus interface operation mode select.
Bit 3 ( UINVEN ) : Enable UART TXD and RXD port inverse output.
Bit 6 ~ Bit 5 ( UMODE1 ~ UMODE0 ) : UART Transmission Mode Select Bit
Bit 4 ~ Bit 2 ( BRATE2 ~ BRATE1 ) : Transmit Baud Rate Select
BRATE2
0
TC2CK1
0
0
0
0
1
1
1
1
UMODE1
TXE = “0” : Disable
TXE = “1” : Enable
0
0
1
1
UINVEN = “0” : Disable TXD and RXD port inverse output.
UINVEN = “1” : Enable TXD and RXD port inverse output.
0
0
1
1
Bit 6
0
BRATE1
SBIM1
Bit 5
0
0
1
1
0
0
1
1
TC2CK0
0
1
0
1
SBIM0
Bit 4
(This specification is subject to change without further notice)
UMODE0
BRATE0
0
1
0
1
0
1
0
1
0
1
0
1
UINVEN
Bit 3
Product Specification (V1.0) 07.26.2005
Baud Rate
Bit 2
Fc/104
Fc/208
Fc/416
Fc/13
Fc/26
Fc/52
Fc/96
TC4
0
Operation Mode
UART mode
SPI mode
Reserved
I/O mode
Mode1: 7-bits
Mode2: 8-bits
Mode3: 9-bits
UART Mode
Reserved
Bit 1
0
e.g. Fc=8MHz
38400
19200
9600
4800
2400
1200
Bit 0
0