IBM EM78P809N Manuale Utente
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
Se
le
le
ct
o
r
TC4
RX Control
TX Control
Interrupt
Control
RX shift register
URRD
URTD
URRD8
RX
TX
Parity control
Error flag
Data Bus
URTD8
RXE
TXE
UINVEN
UINVEN
Fsystem
Fig. 11. Function Block Diagram