Quatech MPAP-100 Manual do Utilizador descarregar pdf (Página 38)

10.3.1 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 MPAP-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.14

Assert transmit DMA request when entry location

of internal FIFO is empty.

WR7A'

Enable WR7A'.10WR15A

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

4-3

Use W/REQA for receive. 15

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.

WR1A

FunctionValueBit(s)Register

Table 6 --- Configuring the SCC for FIFO use with channel A only

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 63 64

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Quatech MPAP-100 Manual do Utilizador Página 38