
174 Rabbit 3000 Microprocessor
Table 12-15. Serial Port Control Register Ports C and D
Serial Port x Control Register (SCCR) (Address = 0xE4)
(SDCR) (Address = 0xF4)
Bit(s) Value Description
7:6
00 No operation. These bits are ignored in the async mode.
01 In clocked serial mode, start a byte receive operation.
10 In clocked serial mode, start a byte transmit operation.
11
In clocked serial mode, start a byte transmit operation and a byte receive
operation simultaneously.
5
0 Enable the receiver input.
1 Disable the receiver input.
4 x This bit is ignored.
3:2
00 8 bits per character.
01
7 bits per character. In this mode the most significant bit of a byte is ignored for
transmit, and is always zero in receive data.
10
Clocked serial mode with external clock.
Serial Port C clock is on Parallel Port PF1
Serial Port D clock is on Parallel Port PF0
11
Clocked serial mode with internal clock.
Serial Port C clock is on Parallel Port PF1
Serial Port D clock is on Parallel Port PF0
1:0
00 The serial port interrupt is disabled.
01 The serial port uses Interrupt Priority 1.
10 The serial port uses Interrupt Priority 2.
11 The serial port uses Interrupt Priority 3.
Comentarios a estos manuales