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bq3285LD Datasheet(PDF) 2 Page - Texas Instruments |
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bq3285LD Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 28 page  Block Diagram Pin Descriptions MOT Bus type select input MOT selects bus timing for either Motorola or Intel architecture. This pin should be tied to VCC for Motorola timing or to VSS for Intel timing (see Table 1). The setting should not be changed during system opera- tion. MOT is internally pulled low by a 30K Ω resistor. AD0–AD7 Multiplexed address/data input/output The bq3285ED/LD bus cycle consists of two phases: the address phase and the data- transfer phase. The address phase pre- cedes the data-transfer phase. During the address phase, an address placed on AD0–AD7 and EXTRAM is latched into the bq3285ED/LD on the falling edge of the AS signal. During the data-transfer phase of the bus cycle, the AD0–AD7 pins serve as a bidirectional data bus. AS Address strobe input AS serves to demultiplex the address/data bus. The falling edge of AS latches the ad- dress on AD0–AD7 and EXTRAM. This de- multiplexing process is independent of the CS signal. For DIP and SOIC packages with MOT = VSS, the AS input is provided a signal similar to ALE in an Intel-based sys- tem. 2 bq3285ED/LD Bus Type MOT Level DS Equivalent R/W Equivalent AS Equivalent Motorola VCC DS,E,or Φ2 R/W AS Intel VSS RD, MEMR,or I/OR WR, MEMW,or I/OW ALE Table 1. Bus Setup BD328501.eps P Bus I/F µ Power- Fail Control Storage Registers (114 Bytes) User Buffer (14 Bytes) VOUT Clock/Calendar, Alarm and Control Bytes Time- Base Oscillator Control/Status Registers ÷ 8 ÷ 64 ÷ 64 16 1 MUX : Interupt Generator Control/Calendar Update VCC DS AD0–AD7 CS MOT 32K INT X1 X2 3 4 RST R/W AS Storage Registers (128 Bytes) RCL EXTRAM Write Protect CS BC 32K Driver July 1997 |
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