SA1110 Datasheet, PDF (277/406 Pages) Intel Corporation – Intel StrongARM SA-1110 Microprocessor

Peripheral Control Module
Reset
0h 8004 0060
7
6
AME
TIE
?
?
Bits
Name
3
TXE
4
RXE
5
RIE
6
TIE
7
AME
HSCR0
Read/Write
5
4
3
2
1
0
RIE
RXE
TXE
TUS
LBM
ITR
?
0
0
?
?
?
(Sheet 2 of 2)
Description
Transmit enable.
0 – HSSP transmit logic disabled; control of the TXD2 pin is given to the PPC unit if ITR=1.
1 – HSSP transmit logic enabled if ITR=1.
Note: A SIP is transmitted immediately after the transmitter is enabled (TXE = 0 → 1).
Receive enable.
0 – HSSP receive logic disabled; control of the RXD2 pin is given to the PPC unit if ITR =1.
1 – HSSP receive logic enabled if ITR=1.
Receive FIFO interrupt enable.
0 – Receive FIFO two- or three-fifths full or more condition does not generate an interrupt
(RFS bit ignored).
1 – Receive FIFO two- or three-fifths full or more condition generates an interrupt (state of
RFS sent to interrupt controller).
Transmit FIFO interrupt enable.
0 – Transmit FIFO half-full or less condition does not generate an interrupt (TFS bit ignored).
1 – Transmit FIFO half-full or less condition generates an interrupt (state of TFS sent to
interrupt controller).
Address match enable.
0 – Disable receiver address match function, store data from all incoming frames in receive
FIFO.
1 – Enable receiver address match function; do not FIFO data unless address recognized
or incoming address contains all ones (0hFF).
11.10.7 HSSP Control Register 1
HSSP control register 1 (HSCR1) contains the 8-bit address match value field that is used by the
HSSP to selectively receive frames.
Note: A question mark (?) signifies that the Reset value of that bit is undefined when the processor has
completed its reset cycle.
11.10.7.1 Address Match Value (AMV)
The 8-bit address match value (AMV) field is programmed with an address value that is used to
selectively store only the data within receive frames that have the same address value. The address
match enable (AME) bit must be set to enable this function. For incoming frames, which have the
same address value as the AMV field, the frame’s address, control, and data are stored in the
receive FIFO. For those that do not, the remainder of the frame is ignored and the receive logic
switches to hunt mode, looking for the preamble in the incoming data stream. One special address
exists, which is always matched by the address match logic regardless of the value programmed in
AMV. When address matching is enabled, whenever a frame is received with an address containing
all ones (11111111), the value programmed in AMV is ignored and the frame data is automatically
stored in the receive FIFO. The address value is contained within the first byte of data in a frame
following the flag. AMV can be written at any time and is used for comparison with the next frame,
which occurs following its update.
SA-1110 Developer’s Manual
11-97