IBM EM78P312N Benutzerhandbuch
EM78P312N
8-Bit Microcontroller
Product Specification
(V1.0) 10.03.2006
• 15
(This specification is subject to change without further notice)
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
reserved
-
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 starting transmission shifting.
will be cleared by hardware when enabling the transmission. UTBE bit
is read-only. Therefore, writing to the URTD register is necessary
when starting transmission shifting.
Bit 0 ( TXE )
: Enable transmission
TXE = “0” :
Disable
TXE = “1” :
Enable
Bank 2 R6 URC2 (UART Control Register 2)
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.
Bank 2 R7 URS (UART Status Register)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
URRD8 EVEN PRE PRERR OVERR FMERR URBF RXE
Bit 7 ( URRD8 ) :
Receiving data Bit 8