Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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C8051F120/1/2/3 C8051F124/5/6/7 Preliminary 1.9. Comparators and DACs Each C8051F12x MCU has two 12-bit DACs and two comparators on chip. The MCU data and control interface to each comparator and DAC is via the Special Function Registers. The MCU can place any DAC or comparator in low power shutdown mode. The comparators have software programmable hysteresis and response time. The response time of the comparators can be adjusted to minimize power consumption, or to maximize speed. Each comparator can generate an interrupt on its rising edge, falling edge, or both; these interrupts are capable of waking up the MCU from sleep mode. The comparators' output state can also be polled in software. The comparator outputs can be programmed to appear on the Port I/O pins via the Crossbar. The DACs are voltage output mode, and include a flexible output scheduling mechanism. This scheduling mechanism allows DAC output updates to be forced by a software write or a Timer 2, 3, or 4 overflow. The DAC voltage reference is supplied via the dedicated VREFD input pin on C8051F120/2/4/6 devices or via the internal voltage reference on C8051F121/3/5/7 devices. The DACs are useful as references for the comparators or offsets for the differential inputs of the ADC. Figure 1.12. Comparator and DAC Diagram (Port I/O) (Port I/O) CP0 CP1 CROSSBAR CP0+ CP0- + CP0 - CP1+ CP1- + CP0 CP1 - CP1 SFR's (Data and Cntrl) CIP-51 and Interrupt Handler REF DAC0 DAC0 REF DAC1 DAC1 Page 34 DS008-0.8-AUG02 © 2002 Cygnal Integrated Products, Inc.
Preliminary C8051F120/1/2/3 C8051F124/5/6/7 2. ABSOLUTE MAXIMUM RATINGS Table 2.1. Absolute Maximum Ratings * PARAMETER CONDITIONS MIN TYP MAX UNITS Ambient temperature under bias -55 125 °C Storage Temperature -65 150 °C Voltage on any Pin (except VDD and Port I/O) with respect to DGND Voltage on any Port I/O Pin or /RST with respect to DGND -0.3 VDD + 0.3 V -0.3 5.8 V Voltage on VDD with respect to DGND -0.3 4.2 V Maximum Total current through VDD, AV+, DGND, 800 mA and AGND Maximum output current sunk by any Port pin 100 mA Maximum output current sunk by any other I/O pin 50 mA Maximum output current sourced by any Port pin 100 mA Maximum output current sourced by any other I/O pin 50 mA * Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the devices at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. © 2002 Cygnal Integrated Products, Inc. DS008-0.8-AUG02 Page 35
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Preliminary C8051F120/1/2/3 C8051F124/5/6/7 - KEMT FEI TUKE

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