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AT83C24B-TISUM Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT83C24B-TISUM Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 42 page  10 4234F–SCR–10/05 AT83C24 – over-current detection on CVCC – VCARDERR bit set in CONFIG0 register (out of range voltage on CVCC or bit set by software) Card Presence Detection The card presence is provided by the CPRES pin. The polarity of card presence contact is selected with the CARDDET bit (see CONFIG1 register). A programmable filtering is controlled with the CDS[2-0] bits (see CONFIG1 register). An internal pull-up on the CPRES pin can be disconnected in order to reduce the consumption, an external pull-up must then be connected to VCC. The PULLUP bit (see CONFIG1 register) controls this feature. The card presence switch is usually connected to Vss (card present if CPRES=1). The CARD- DET bit must be set. The internal pull up can be connected. If the card presence contact is connected to Vcc (card present if CPRES=0), the internal pull-up must be disconnected (see PULLUP bit) and an external pull-down must be connected to the CPRES pin. An interrupt can be generated if a card is inserted or extracted (see interrupts §). Figure 4. Card Presence Input PULLUP Bit CARDDET Bit = 1 Closed = 0 Open = 1 No Card if CPRES = 0 = 0 No Card if CPRES = 1 CARDIN bit = 1 Card Inserted = 0 No Card IT Controller CPRES PRES/INT FILTERING CDS[2-0] VCC INT_PULLUP Bit = 1 Closed = 0 Open EVCC IT_SEL Bit (See Table 18) Card Presence Contact VCC VCC Card Presence Contact VSS VSS External Pull-up External Pull-down Internal Pull-up |
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