EM78P809N
8-Bit Microcontroller
4.7 UART (Universal Asynchronous Receiver/Transmitter)
Registers for UART Circuit
R_BANK Address NAME Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1 Bit 0
BANK 2
BANK 2
BANK 2
BANK 2
BANK 2
BANK 0
SFR
0X05
0X06
0X07
0X08
0X09
0x0F
0x0F
URC1 URTD8 UMODE1 UMODE0 BRATE2 BRATE1 BRATE0 UTBE
TXE
R/W
0
R/W
0
R/W
0
R/W
SBIM1
R/W
R/W
SBIM0 UINVEN
R/W R/W
R/W
R/W
0
R
0
URC2
--
--
--
--
--
URS URRD8 EVEN
R/W R/W
PRE
PRERR OVERR FMERR URBF
R/W R/W R/W
RXE
R/W
R/W
R
URRD URRD7 URRD6 URRD5 URRD4 URRD3 URRD2 URRD1 URRD0
R
R
R
R
R
R
R
R
URTD URTD 7 URTD 6 URTD 5 URTD 4 URTD 3 URTD 2 URTD 1 URTD0
W
0
W
W
W
W
W
W
0
W
ISFR2
IMR2
UERRIF
R/W
RBFF
R/W
TBEF
R/W
UTIE
R/W
TBIF
R/W
TBIE
R/W
EXIF1
R/W
TCIF0
R/W
--
0
--
0
UERRIE
R/W
URIE
R/W
EXIE1
R/W
TCIE0
R/W
--
--
TC4
Baud rate
generator
Fsystem
RX Control
Interrupt
Control
TX Control
TXE
RXE
RX
RX shift register
Parity control
TX
URRD
URTD8
URRD8
Error flag
Data Bus
URTD
UINVEN
UINVEN
Fig. 11. Function Block Diagram
Product Specification (V1.0) 07.26.2005
• 33
(This specification is subject to change without further notice)