F81218
5.2.1.11 MODEM Status Register – Base + 6
Power-on default [7:0] = 0xX0h.
Bit
Name
R/W
Description
7
DCD
RI
R
Complement of DCD# input. In loop back mode, this bit is equivalent
to OUT2 in MCR.
6
5
4
3
2
1
0
R
R
R
R
R
R
R
Complement of RI# input. In loop back mode , this bit is equivalent to
OUT1 in MCR
DSR
CTS
Complement of DSR# input. In loop back mode , this bit is
equivalent to DTR in MCR
Complement of CTS# input. In loop back mode , this bit is equivalent
to RTS in MCR
DDCD
TERI
0 : No state changed at DCD#.
1 : State changed at DCD#.
0 : No Trailing edge at RI#.
1 : A low to high transition at RI#.
0 : No state changed at DSR#.
DDSR
DCTS
1 : State changed at DSR#.
0 : No state changed at CTS#.
1 : State changed at CTS#.
5.2.1.11 Scratch Register – Base + 7
Power-on default [7:0] = 0x00h.
Bit
7:0
Name
R/W
Description
SCR_DATA[7:0]
R/W
Scratch register.
5.3 IR Function
The F81218 infrared interface provides a two way wireless communications port using
infrared as the transmission medium. The IrDA 1.0 (SIR) is found in UART1 and UART2. IrDA SIR
specifies asynchronous serial communication at baud rate up to 115.2Kbps. Each byte is sent serial
LSB first beginning with a zero value start bit. A zero is signaled by sending a single infrared pulse at
the beginning of the serial bit time. A one is signaled by the absence of an infrared pulse during the
-16-
August, 2007
V0.33P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
