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EM78P809N
8-Bit Microcontroller
18 •
Product Specification (V1.0) 07.26.2005
(This specification is subject to change without further notice)
Bit 6 ~ Bit 5 ( UMODE1 ~ UMODE0 ) : UART Transmission Mode Select Bit
UMODE1 UMODE0 UART Mode
0 0 Mode1: 7-bits
0 1 Mode2: 8-bits
1 0 Mode3: 9-bits
1 1 Reserved
Bit 4 ~ Bit 2 ( BRATE2 ~ BRATE1 ) : Transmit Baud Rate Select
BRATE2 BRATE1 BRATE0 Baud Rate e.g. Fc=8MHz
0 0 0 Fc/13 38400
0 0 1 Fc/26 19200
0 1 0 Fc/52 9600
0 1 1 Fc/104 4800
1 0 0 Fc/208 2400
1 0 1 Fc/416 1200
1 1 0 TC4
1 1 1 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
0 0 I/O mode
0 1 SPI mode
1 0 UART mode
1 1 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.