Datasheet

880
32072H–AVR32–10/2012
AT32UC3A3
32.7.3 Status register
Name :
SR
Access Type : Read Only
Offset : 0x08
Reset Value : 0x00001020
•
ISTA : Insertion Status. It reflects the Memory Stick card presence. This is the inverse of INS pin.
0 : No card.
1 : Card is inserted.
•
RDY : Ready. RDY goes to 1 when the protocol ends. This bit bit is cleared to 0 by write to the command register.
0 : Command receive disabled due to communication with the Memory Stick.
1 : Command received or protocol ended.
•
EMP : FIFO Empty. This bit is set to 1 by writing system register bit FCLR=1.
0 : FIFO contains data.
1 : FIFO is empty.
•
FUL : FIFO Full. This bit is cleared to 0 by writing system register bit FCLR=1.
0 : FIFO has empty space.
1 : FIFO is full.
•
CED : MS Command End.
In parallel mode, this bit reflects the CED bit in the status register of a Memory Stick (INT). Indicates the end of a
command executed with SET_CMD TPC. In serial mode, this bit is always 0. It is cleared to 0 by writing to the command
register (CMD).
•
ERR : Memory Stick Error.
In parallel mode, this bit reflects the ERR bit in the status register of a Memory Stick (INT). It indicates the occurence
of an error. In serial mode, this bit is always 0. It is cleared to 0 by writing to the command register (CMD).
31 30 29 28 27 26 25 24
--------
23 22 21 20 19 18 17 16
-------ISTA
15 14 13 12 11 10 9 8
---RDY----
76543210
- - EMP FUL CED ERR BRQ CNK