Digi Rabbit 5000, User Manual

Page: 185 / 414

Chapter 17 Serial Ports A – D 185
Serial Port x Extended Register (SAER) (Address = 0x00C5)
(Clocked Serial Mode Only) (SBER) (Address = 0x00D5)
(SCER) (Address = 0x00E5)
(SDER) (Address = 0x00F5)
Bit(s) Value Description
7 0 Normal clocked serial operation.
1 Timer-synchronized clocked serial operation.
6 0 Timer-synchronized clocked serial uses Timer B1.
1 Timer-synchronized clocked serial uses Timer B2.
5:4 00 Normal clocked serial clock polarity, inactive high. Internal or external clock.
01 Normal clocked serial clock polarity, inactive low. Internal clock only.
10 Inverted clocked serial clock polarity, inactive low. Internal or external clock.
11 Inverted clocked serial clock polarity, inactive high. Internal clock only.
3 0 Normal bit order (LSB first) for transmit and receive.
1 Reverse bit order (MSB first) for transmit and receive.
2 0 Serial clock (input mode only) from Parallel Port D (SCER and SDER only).
1 Serial clock (input mode only) from Parallel Port E (SCER and SDER only).
1 0 No effect on transmitter.
1 Terminate current clocked serial transmission. No effect on buffer.
0 0 No effect on receiver.
1 Terminate current clocked serial reception.
Serial Port x Divider Low Register (SADLR) (Address = 0x00C6)
(SBDLR) (Address = 0x00D6)
(SCDLR) (Address = 0x00E6)
(SDDLR) (Address = 0x00F6)
Bit(s) Value Description
7:0
Eight LSBs of the divider that generates the serial clock for this channel. This
divider is not used unless the MSB of the corresponding SxDHR is set to one.