ADUC814 datasheet(10/72 Pages) AD

Part #	ADUC814

Description	MicroConverter, Small Package 12-Bit ADC with Embedded Flash MCU

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Manufacturer	AD [Analog Devices]

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ADuC814

Rev. A | Page 10 of 72

PIN CONFIGURATION AND FUNCTION DESCRIPTION

ADuC814

TOP VIEW

(Not to Scale)

DGND

1

DLOAD

2

P3.0/RxD

3

P3.1/TxD

4

P3.2/INT0

5

DVDD

XTAL2

XTAL1

SCLOCK

P3.7/SDATA/MOSI

28

27

26

25

24

P3.3/INT1

6

P3.4/T0/CONVST

7

P1.0/T2

8

P1.1/T2EX

9

P3.6/MISO

P3.5/T1/SS/EXTCLK

P1.7/ADC5/DAC1

P1.6/ADC4/DAC0

23

22

21

20

RESET 10

P1.5/ADC3

19

P1.2/ADC0 11

P1.3/ADC1 12

AVDD 13

AGND 14

P1.4/ADC2

CREF

VREF

AGND

18

17

16

15

Figure 2. Pin Configuration

Table 3. Pin Descriptions

Pin No.

Mnemonic

Type

Function

1

DGND

S

Digital Ground. Ground reference point for the digital circuitry.

2

DLOAD

I

Debug/Serial Download Mode. Enables when pulled high through a resistor on power-on or RESET. In

this mode, DLOAD may also be used as an external emulation I/O pin, therefore the voltage level at

this pin must not be changed during this mode of operation because it may cause an emulation

interrupt that halts code execution. User code is executed when this pin is pulled low on power-on or

RESET.

3–7

P3.0 – P3.4

I/O

Bidirectional Port Pins with Internal Pull-Up Resistors. Port 3 pins that have 1s written to them are

pulled high by the internal pull-up resistors, and in that state they can be used as inputs. As inputs,

with Port 3 pins being pulled low externally, they source current because of the internal pull-up

resistors. When driving a 0-to-1 output transition, a strong pull-up is active during S1 of the

instruction cycle. Port 3 pins also have various secondary functions which are described next.

3

P3.0/RxD

I/O

Receiver Data Input (asynchronous) or Data Input/Output (synchronous) in Serial (UART) Mode.

4

P3.1/TxD

I/O

Transmitter Data Output (asynchronous) or Clock Output (synchronous) in Serial (UART) Mode.

5

P3.2/INT0

I/O

Interrupt 0, programmable edge or level-triggered interrupt input, which can be programmed to one

of two priority levels. This pin can also be used as agate control input to Timer 0.

6

P3.3/INT1

I/O

Interrupt 1, programmable edge or level-triggered interrupt input, which can be programmed to one

of two priority levels. This pin can also be used as agate control input to Timer 1.

7

P3.4/T0/

CONVST

I/O

Timer/Counter 0 Input and External Trigger Input for ADC Conversion Start.

8–9

P1.0–P1.1

I/O

Bidirectional Port Pins with Internal Pull-Up Resistors. Port 1 pins that have 1s written to them are

pulled high by the internal pull-up resistors, and in that state they can be used as inputs. As inputs

,with Port 1 pins being pulled low externally, they source current because of the internal pull-up

resistors When driving a 0-to-1 output transition a strong pull-up is active during S1 of the instruction

cycle. Port 1 pins also have various secondary functions which are described as follows.

8

P1.0/T2

I/O

Timer 2 Digital Input. Input to Timer/Counter 2. When enabled, Counter 2 is incremented in response

to a 1 to 0 transition of the T2 input.

9

P1.1/T2EX

I/O

Digital Input. Capture/Reload trigger for Counter 2.

10

RESET

I

Reset Input. A high level on this pin while the oscillator is running resets the device. There is an

internal weak pull-down and a Schmitt-trigger input stage on this pin.

11–12

P1.2–P1.3

I

Port 1.2 to P1.3. These pins have no digital output drivers, i.e., they can only function as digital inputs,

for which 0 must be written to the port bit. These port pins also have the following analog functionality:

11

P1.2/ADC0

I

ADC Input Channel 0. Selected via ADCCON2 SFR.

12

P1.3/ADC1

I

ADC Input Channel 1. Selected via ADCCON2 SFR.

13

AVDD

S

Analog Positive Supply Voltage, 3 V or 5 V.

14–15

AGND

G

Analog Ground. Ground reference point for the analog circuitry.

16

VREF

I/O

Reference Input/Output. This pin is connected to the internal reference through a switch and is the

reference source for the analog to digital converter. The nominal internal reference voltage is 2.5 V

and this appears at the pin. This pin can be used to connect an external reference to the analog to

digital converter by setting ADCCON1.6 to 1. Connect 0.1 µF between this pin and AGND.

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