Rabbit 3000 User Manual page 158

Serial Port x Data Register
Bit(s) Value
Read
7:0
Write
Serial Port x Address Register
Bit(s) Value
Read
7:0
Write
150
Table 12-8. Data Register All Ports
Returns the contents of the receive buffer.
Loads the transmit buffer with a data byte for transmission.
Table 12-9. Address Register All Ports
Returns the contents of the receive buffer. In Clocked Serial mode reading the
data from this register automatically causes the receiver to start a byte receive
operation (the current contents of the receive buffer are read first), eliminating
the need for software to issue the Start Receive command.
Loads the transmit buffer with an address byte, marked with a "zero" address bit,
for transmission. In HDLC mode, the last byte of a frame must be written to this
register to enable subsequent CRC and closing Flag transmission. In Clocked
Serial mode writing the data to this register causes the transmitter to start a byte
transmit operation, eliminating the need for the software to issue the Start
Transmit command.
(SADR) (Address = 0xC0)
(SBDR) (Address = 0xD0)
(SCDR) (Address = 0xE0)
(SDDR) (Address = 0xF0)
(SEDR) (Address = 0xC8)
(SFDR) (Address = 0xD8)
Description
(SAAR) (Address = 0xC1)
(SBAR) (Address = 0xD1)
(SCAR) (Address = 0xE1)
(SDAR) (Address = 0xF1)
(SEAR) (Address = 0xC9)
(SFAR) (Address = 0xD9)
Description
Rabbit 3000 Microprocessor