ADUC814_02 AD [Analog Devices], ADUC814_02 Datasheet - Page 14

• Manufacturer Part Number: ADUC814_02
• Description: MicroConverter, Small Package 12-Bit ADC with Embedded FLASH MCU
• Manufacturer: AD [Analog Devices]

Pin No.
1
2
3-7
3
4
5
6
7
8-9
8
9
10
11-12
11
12
13
14, 15
ADuC814
Mnemonic
DGND
DLOAD
P3.0–P3.4
P3.0/RXD
P3.1/TXD
P3.2/INT0
P3.3/INT1
P3.4/T0/CONVST I/O
P1.0–P1.1
P1.0/T2
P1.1/T2EX
RESET
P1.2–P1.3
P1.2/ADC0
P1.3/ADC1
AV
AGND
DD
Type*
S
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I
I
I
S
G
Function
Digital Ground. Ground reference point for the digital circuitry.
Enables Debug/Serial Download Mode 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,
and therefore, the voltage level at this pin must not be changed during this mode of
operation since it may cause an emulation interrupt that will halt code execution. User
code is executed when this pin is pulled low on power-on or RESET.
P3.0–P3.4 are 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, can
be used as inputs. As inputs, Port 3 pins being pulled externally low will 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 that are described below.
Receiver Data Input (Asynchronous) or Data Input/Output (Synchronous) in Serial
(UART) Mode
Transmitter Data Output (Asynchronous) or Clock Output (Synchronous) in Serial
(UART) Mode
Interrupt 0 programmable edge or level triggered interrupt input, that can be
programmed to one of two priority levels. This pin can also be used as a gate control
input to Timer 0.
Interrupt 1 programmable edge or level triggered interrupt input, that can be programmed
to one of two priority levels. This pin can also be used as a gate control input to Timer 1.
Timer/Counter 0 Input and External Trigger Input for ADC Conversion Start
P1.0–P1.1 are 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,
can be used as inputs. As inputs, Port 1 pins being pulled externally low will source
current because of the internal pull-up resistors. When driving a 0-to-1 output transi-
tion, a strong pull-up is active during S1 of the instruction cycle. Port 1 pins also have
various secondary functions that are described below.
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.
Digital Input. Capture/reload trigger for Counter 2.
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.
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.
ADC Input Channel 0, Selected via ADCCON2 SFR
ADC Input Channel 1, Selected via ADCCON2 SFR
Analog Positive Supply Voltage, 3 V or 5 V
Analog Ground. Ground reference point for the analog circuitry.
PIN FUNCTION DESCRIPTIONS
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REV. 0