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EM78P809N
8-Bit Microcontroller
Product Specification (V1.0) 07.26.2005
• 33
(This specification is subject to change without further notice)
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 0X05 URC1 URTD8 UMODE1 UMODE0 BRATE2 BRATE1 BRATE0 UTBE TXE
R/W R/W R/W R/W R/W R/W R R/W
BANK 2 0X06 URC2 0 0 SBIM1 SBIM0 UINVEN 0 0 0
-- -- R/W R/W R/W -- -- --
BANK 2 0X07 URS URRD8 EVEN PRE PRERR OVERR FMERR URBF RXE
R/W R/W R/W R/W R/W R/W R R/W
BANK 2 0X08 URRD URRD7 URRD6 URRD5 URRD4 URRD3 URRD2 URRD1 URRD0
R R R R R R R R
BANK 2 0X09 URTD URTD 7 URTD 6 URTD 5 URTD 4 URTD 3 URTD 2 URTD 1 URTD0
W W W W W W W W
BANK 0 0x0F ISFR2 0 UERRIF RBFF TBEF TBIF EXIF1 0 TCIF0
-- R/W R/W R/W R/W R/W -- R/W
SFR 0x0F IMR2 0 UERRIE URIE UTIE TBIE EXIE1 0 TCIE0
-- R/W R/W R/W R/W R/W -- R/W
Baud rate
generator
Selector
TC4
RX Control TX ControlInterrupt
Control
RX shift register
URRD
URTDURRD8
RX
TX
Parity control
Error flag
Data Bus
URTD8
RXE
TXE
UINVEN
UINVEN
Fsystem
Fig. 11. Function Block Diagram