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AN-644 APPLICATION NOTE Frequency Measurement Using Timer 2 on a MicroConverter

Development systems for evaluation of the following products: If this bit is not set by the user within the watchdog timeout period, the watchdog generates a reset or interrupt, depending on WDIR. Voltage Datasbeet from DAC1. This means that the contents of a separate bit register appears in the three SFRs: The security modes available on the parts are as follows: Cleared by the user to disable autoswapping of the DPTR.

Note that the serial port debugger is fully contained on the part unlike ROM monitor type debuggersand therefore no external memory is needed to enable in-system debug sessions. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Assuming a valid start bit is detected, character reception continues. This configuration is shown in Figure Port 2 emits the high-order address bytes daatsheet accesses to the external bit external data memory space. Sample availability may be better than production availability. Parallel Port Commands In Turing.

In this mode, emulation access is gained by connection to a single pin, the EA pin.

ADuC841 ADuC842 ADuC843 /

When held high, this input enables the device to fetch code from internal program memory locations. Port 2 is a bidirectional port with internal pull-up resistors. Port 2 emits the middle order address byte during accesses to the external bit external data memory space. If the parts need to assert the SS pin on an external slave device, a port digital output pin should be used. Set to 1 for gain calibration. The I2C interface has also been enhanced to offer repeated start, general call, and quad addressing.


Because the DMA logic uses pipelining, it takes three cycles before the first correct result is written out.

ADuC Datasheet(PDF) – Analog Devices

Over every clocks, datasbeet PWM compensates for the fact that the output should be slightly above one quarter of full scale by having a high cycle followed by only two low cycles. In this application, it uses strong internal pull-ups when emitting 1s. Set to 1 by the user to enable the power supply monitor circuit. Afuc843 by the user to enable the 32 kHz oscillator in power-down mode. To configure this port pin as a digital input, write a 0 to the port bit. Set by the user to enable a capture or reload to occur as a result of a negative transition on T2EX if Timer 2 is not being used to clock the serial port.

Time interval counter TIC. TH1 and TL1 are cascaded; there is no prescaler. As mentioned earlier, the parts offer an extended bit stack pointer. The data is transferred as byte-wide 8-bit fatasheet data, MSB first. The INT0 pin must not be driven low during or within two machine cycles of the instruction that initiates power-down mode. But somewhere around 7 mA, the upper curve in Figure 45 drops below 2.

When enabled, qduc843 watchdog circuit generates a system reset or interrupt WDS if the user program fails to set the watchdog WDE bit within a predetermined amount of time see PRE bits in Table This allows a full rail-to-rail output from the DAC, which should then be ratasheet externally using a datasheer op amp in order to get a rail-torail output. Increasing the gain coefficient compensates for a smaller analog input signal range and scales the ADC transfer function up, effectively increasing the slope of the transfer function.

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Set to 1 by the user to leave the output of DAC0 at its normal level. Such an op amp would need to fully settle from datsaheet small signal transient in less than ns in order to guarantee adequate settling under all software configurations. Set to 0 for offset calibration. Cleared under the following conditions: Dual data pointers, extended bit stack pointer. Timer 0 Timer or Counter Select Bit.

Note that no result is written to the last two memory locations. Cleared by the user to allow the interval counter to be automatically reloaded and start counting again at each interval timeout. Clock Phase Select Bit. The user can choose to poll the I2CI bit or to enable the interrupt. This is a read-only bit that directly reflects the state of the DVDD comparator. As per standard design practice, be sure to include all of adud843 capacitors, and ensure the smaller capacitors are close to each AVDD pin with trace lengths as short as possible.

In this mode, the EXF2 flag, however, can still cause interrupts, which can be used as a third external interrupt. Figure 83 illustrates the operation of the internal POR in detail.

This is done using the Timer 2 counter input pin, dxtasheet increments the Timer 2 registers on a 1-to-0 transition. Thus, any core instructions that access the external memory while DMA mode is enabled does not get access to the external memory. Timer 1 Timer or Counter Select Bit. But at clock speeds slower that kHz, the ADC can no longer function correctly.