Jameco-electronics Rabbit 3000 Manual de usuario descargar pdf (Pagina 177)

168 Rabbit 3000 Microprocessor

Table 12-8. Data Register All Ports

Serial Port x Data Register (SADR) (Address = 0xC0)

(SBDR) (Address = 0xD0)

(SCDR) (Address = 0xE0)

(SDDR) (Address = 0xF0)

(SEDR) (Address = 0xC8)

(SFDR) (Address = 0xD8)

Bit(s) Value Description

7:0

Read Returns the contents of the receive buffer.

Write Loads the transmit buffer with a data byte for transmission.

Table 12-9. Address Register All Ports

Serial Port x Address Register (SAAR) (Address = 0xC1)

(SBAR) (Address = 0xD1)

(SCAR) (Address = 0xE1)

(SDAR) (Address = 0xF1)

(SEAR) (Address = 0xC9)

(SFAR) (Address = 0xD9)

Bit(s) Value Description

7:0

Read

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.

Write

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

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.

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Jameco-electronics Rabbit 3000 Manual de usuario Pagina 177