ISA-to-PC-Card (PCMCIA) Controllers
—
PD6710/
’
22
Datasheet
53
Bit 0
—
Battery Dead Or Status Change
When the socket is configured for memory card support, this bit is set to
‘
1
’
when a BVD1 battery
dead high-to-low transition has been detected. When the socket is configured for I/O card support,
this bit is set to
‘
1
’
when the BVD1/-STSCHG pin (see
Table 2 on page 20
) changes from either
high to low or low to high. This bit is reset to
‘
0
’
whenever this register is read. In I/O Card
Interface mode, function of this bit is not affected by bit 7 of the
Interrupt and General Control
register.
Bit 1
—
Battery Warning Change
When a socket is configured for memory card support, this bit is set to
‘
1
’
when a high-to-low
transition on BVD2 occurs indicating a battery warning was detected. This bit should be ignored
when the socket is configured for I/O card support. This bit is reset to
‘
0
’
whenever this register is
read.
Bit 2
—
Ready Change
When this bit is
‘
1
’
, a change has occurred in the card RDY/-IREQ pin (see
Table 2 on page 20
).
This bit will always read 0 when the card is configured as an I/O card. This bit is reset to
‘
0
’
whenever this register is read.
Bit 3
—
Card Detect Change
When this bit is
‘
1
’
, a change has occurred on the -CD1 or -CD2 pins (see
Table 2 on page 20
).
This bit is reset to
‘
0
’
whenever this register is read.
0
A transition (from high to low for memory card support or either high to low or low to high for I/O
card support) on the BVD1/-STSCHG pin has not occurred since this register was last read.
1
A transition on the BVD1/-STSCHG pin has occurred.
0
A transition (from high to low) on the BVD2 pin has not occurred since this register was last
read.
1
A transition on the BVD2 pin has occurred.
0
A transition on the RDY/-IREQ pin has not occurred since this register was last read.
1
A transition on the RDY/-IREQ pin has occurred.
0
A transition on the -CD1 or -CD2 pins has not occurred since this register was last read.
1
A transition on the -CD1 or -CD2 pins has occurred.