RB5C396 Ricoh Corporation, RB5C396 Datasheet - Page 71

• Manufacturer Part Number: RB5C396
• Description: PC Card Controller Compliant With Pcmcia 2.1/jeida 4.2
• Manufacturer: Ricoh Corporation

5.2 BVD1 and BVD2 Pins
card (bit5 is set to “0” in the Interrupt and General Control Register (Index : 03h)). Based on output signals from
the PC card, the BVD1 and BVD2 pin signals are defined as shown in the table below :
· Interface Status Register (Index : 01h) : bit1 ( for the BVD2 pin) and bit0 (for the BVD1 pin)
· Card Status Change Register (Index : 04h) : bits1 and 0
· Card Status Interrupt Configuration Register (Index : 05h) : bit1 and bit0
5.3 STSCHG#/RI# Pin
the PC card is the I/O card (bit5 is set to “1” in the Interrupt and General Control Register (Index : 03h)).
dition that the PC card is the I/O card.
· Interface Status Register (Index : 01h) : bit0 (Battery Voltage Detect 1 Bit)
· Card Status Change Register (Index : 04h) : bit0
· Interrupt and General Control Register (Index : 03h) : bit7 (Ring Indicate Enable Bit)
The BVD1 and BVD2 pins function as input pins for battery voltage detection when the PC card is the memory
The STSCHG#/RI# pin functions as an input pin for the Card Status Change# and Ring Indicate# signals when
The internal registers described below also function as those relating to the STSCHG#/RI# pin status on the con-
These bits can be used to specify reading back the BVD1 and BVD2 pins.
Bit1 will be se to “1” upon detection of the battery warning condition, respectively.
Bit0 will be set to “0” upon detection of the battery dead condition, respectively.
Bit1 can be set to “1” to specify generation of interrupts upon detection of the battery warning conditions,
respectively.
Bit0 can be set to “1” to specify generation of interrupts upon detection of the battery dead conditions, respec-
tively.
This bit can be used to specify reading back the STSCHG#/RI# pin.
This bit will be set to “1” upon transition of the Card Status Change# and RI# signals to “0” when bit7
(Ring Indicate Enable Bit) is set to “0” in the Interrupt and General Control Register (Index : 03h).
This bit can be set to “1” to specify output of the RING INDICATE# signal to the RI_OUT# pin.
BVD1
0
0
1
1
BVD2
0
1
0
1
Faulty battery voltage conditions requiring battery replacement but guaran-
teeing data retention.
Faulty battery voltage conditions requiring battery replacement and not guar-
anteeing data retention.
Faulty battery voltage conditions requiring battery replacement and not guar-
anteeing data retention.
Normal battery voltage conditions.
RF5C296/RF5C396L/RB5C396/RF5C396
Battery voltage conditions
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