ACT apricot - Siopindetail

SERIAL INTERFACE
Write Register 1. This register enables/disables the
transmit, receive and external/status interrupts and also
controls the DMA request output.
D7
DO
1 0 1 x 1 x 1 D51 D41 x 1 DIlDO 1 Wri te Register 1
I
o Ext. Interrupt masked
1 Ext. Interrupt enabled
o Tx Interrupt masked
1 Tx Interrupt enabled
o 0 Rx Interrupts masked
1 0 Interrupt on all Rx characters,
parity affects vector.
Interrupt on all Rx characters,
parity does not affect vector.
--DMA output inhibited
SIO PIN DETAIL
The two SIO communication channels are designated
channel A (used for the RS232C link) and channel B (used
for
the keyboard link). On the block diagram at the
beginning of the chapter, connections to channel A are
denoted by
the suffix A (e.g. TxDAJ, and to channel B by the
suffix B (e.g. RxDB). All the remaining inputs and outputs of
the SIO are connections to the processors. A description of
each
pin is detailed on the following pages.