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ADuC841 Datasheet PDF

Shadow Data Pointer Mode. Set by software to select counter operation input from T1 pin.

Single variable resolution PWM on P2. Program Store Enable, Logic Output.

ADuC841 ADuC842 ADuC843 /

This pin is a no connect on the ADuC With the jumper removed, the device comes up in normal mode and runs the program whenever power is cycled or RESET is toggled. The parts power up with their internal voltage reference in the off state. TH0 is an 8-bit timer only, controlled by Timer 1 control bits. In this section of the data sheet, it is assumed that P2. The control and configuration of the interrupt system is carried out through three datashewt SFRs: Set by hardware at the end of the 8th bit in Mode 0, or at the dataasheet of the stop bit in Modes 1, 2, and 3.

Timer 0 Timer or Counter Select Bit. Note that datashewt DIV value must be rounded down.

ADuC Datasheet and Product Info | Analog Devices

There are no restrictions on the duty cycle of the external input signal, but to ensure that a given level is sampled at least once before it changes, it must be held for a minimum of one full machine cycle. The Dataaheet registers include control, configuration, and data registers, which provide an interface between the CPU and other on-chip peripherals. It may be overwritten by user code. If an unoccupied location is read, an unspecified value is returned.


TH0 and TL0 are cascaded; there is no prescaler. Mode 1 is shown in Figure For the previous example, the complete flow of events is shown in Figure When set to 0 by the user, the internal XRAM is not accessible, and the external data memory is mapped into the lower 2 kBytes of external data memory. Cleared by the user datasbeet disable autoswapping of the DPTR.

One hardware solution is to choose a very fast settling op amp to drive each analog input. It is important to note the scheduled dock date on the order entry screen. This monitor function allows the user to save working registers to avoid possible data loss due to the low supply condition, and also ensures that normal code execution does not resume until a safe supply level has been well established. As can be seen, the output of PWM0 P2. Set by the watchdog controller to indicate that a watchdog timeout has occurred.

The model has been scheduled for obsolescence, but may still be purchased for a limited satasheet. Mode 2 configures the timer register as an 8-bit counter TL0 with automatic reload, as shown in Figure Set by the user to enable, or cleared to disable Timer 0 interrupts. Set to 0 by the user to enable the DAC output buffer.

ADuC Datasheet(PDF) – Analog Devices

This means that if a zero output is desired during power-up or power-down transient conditions, then a pulldown resistor must be added to each DAC output. Cleared by the user to stop Timer 2. An interrupt cannot be interrupted by another interrupt of the same priority level.


For more information about lead-free parts, please consult our Pb Lead free information page. Therefore, the user can enable only one interface or the other on these pins at any given time see SPE in Table Busy is automatically cleared by the core at the end of conversion or calibration. Most standard C compilers will be able to compile these files. By power-on default, these pins are configured as analog inputs, that is, 1 written in the corresponding Port 1 register bit.

The model has not been released to general production, but samples may be available. Set by hardware to indicate the source of an I2C interrupt. Cleared automatically at power-on to indicate that the PLL is not correctly tracking the crystal clock.

User configuration and control of all timer operating modes is achieved via three SFRs: The PSMI bit can be used to interrupt the processor.

Each data byte LSB first is preceded by a start bit 0 and followed by a stop bit 1. Although the parts have separate pins for analog and digital ground AGND and DGNDthe user must not tie these to dauc843 separate ground planes datasheet the two ground planes are connected together very close to the part, as illustrated in the simplified example of Figure 84a.

Note that the bytes in the page being addressed must be pre-erased. As inputs, Port 2 pins being pulled externally low source current because of the internal pull-up resistors. The alternate functions of Port 3 pins can be activated only if the corresponding bit latch in the P3 SFR contains a 1.