User`s manual

9.3.1 Using channel A for both transmit and receive
This is the mode in which most applications will run. Set RXSRC (bit 1) in the
Configuration Register to logic 0. This will configure the MPAC-100 to use W/REQA
for receive DMA and DTR/REQA for transmit DMA. In addition to any other desired
SCC configuration, ensure that the following bits are set according to Table 6:
Set DTR/REQA for W/REQA timing.
1
4
Assert transmit DMA request when entry
location of internal FIFO is empty.
05
WR7A'
Enable
WR7A'
.
1
0
WR15A
Enable DMA request-on-transmit on
DTR/REQA.
12WR14A
Disable transmit interrupts.01
Enable receive interrupts on special
conditions only (recommended), or disable
them completely.
11 or
00
4-3
Use W/REQA for receive.
1
5
Set W/REQA for DMA Request mode.16
Enable DMA request on W/REQA. This bit
should be set after the other bits in WR1 are
set as desired.
17
WR1A
Function
Value
Bit(s)
Registe
r
Table 6 --- Configuring the SCC for FIFO use with channel A only
Quatech MPAC-100 User's Manual
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