N76E003AT20 Microcontroller Pinout, Features, Programming, Peripherals

N76E003AT20 is a microcontroller unit from the N76E003 family introduced by Nuvoton. It is an 8-bit, low-power MCU based on 8051 architecture. Moreover, it has a total number of 20 pins, out of which 18 are GPIO pins, memory, and other peripherals.

N76E003AT20 is a high-speed controller with 16 MHz of a powerful oscillator, I2C protocol, an SPI port, and a self wakeup timer. The MCU also has an analog to digital converter, 8-channel PWM, and a fault brake for motor operations. This microcontroller unit finds its applications in consumer products and small projects.

N76E003AT20 Pinout Diagram

The following diagram presents the pinout of the N76E003AT20 microcontroller unit. The color-coding in this pinout diagram is used to distinguish various peripherals such as I2C, SPI, UART, PWM, etc.

N76E003AT20 Microcontroller pinout diagram

N76E003AT20 Pin Configuration

In this section, let’s discuss the pinout of the N76E003AT20 microcontroller.

Number	Pin Name	Function
1	PWM2/IC6/T0/AIN4/P0.5	PWM output 2/Input Capture 6/External count input to Timer 0/ADC Input 4/Port0 bit 5 pin
2	TXD/AIN3/P0.6	Serial data transmission/ADC Input 3/Port 0 bit 6 pin
3	RXD/AIN2/P0.7	Serial data reception/ADC Input 2/Port 0 bit 7 pin
4	RST/P2.0	Reset/Port 2 bit 0 pin
5	INT0/OSCIN/AIN1/P3.0	Interrupt 0/Oscillator Input/ADC Input 1/Port 3 bit 0 pin
6	INT1/AIN0/P1.7	Interrupt 1/ADC Input 0/Port 1 bit 7 pin
7	GND	Ground pin
8	[SDA]/TXD_1/ICPDA/OCDDA/P1.6	Serial data transmission 1/ICP or OCD In/Out/Port 1 bit 6 pin
9	VDD	Power Supply pin
10	PWM5/IC7/SS/P1.5	PWM output 5/Input Capture 7/SPI Select input/Port 1 bit 5 pin
11	P1.4/SDA/FB/PWM1	Port 1 bit 4/I2C data line/Fault Break input/PWM output 1 pin
12	P1.3/SCL/[STADC]	Port 1 bit 3/I2C Clock line/ADC Start trigger pin
13	P1.2/PWM0/IC0	Port 1 bit 2/PWM output 0/Input Capture 0 pin
14	P1.1/PWM1/IC1/AIN7/CLO	Port 1 bit 1/PWM output 1/Input Capture 1/ADC Input 7/Clock Output pin
15	P1.0/PWM2/IC2/SPCLK	Port 1 bit 0/PWM output 2/Input Capture 2/SPI Clock pin
16	P0.0/PWM3/IC3/MOSI/T1	Port 0 bit 0/PWM output 3/Input Capture 3/SPI in/out/External count input to Timer 1 pin
17	P0.1/PWM4/IC4/MISO	Port 0 bit 1/PWM output 4/Input Capture 4/SPI in/out pin
18	P0.2/ICPCK/OCDCK/RXD_1/ [SCL]	Port 0 bit 2/ICP or OCD Clock input/Serial data reception1/I2C Clock pin
19	P0.3/PWM5/IC5/AIN6	Port 0 bit 3/PWM output 5/Input Capture 5/ADC Input 6 pin
20	P0.4/AIN5/STADC/PWM3/IC3	Port 0 bit 4/ADC Input 5/ADC Start trigger pin

PWM Channels: Pulse width Modulation channels are used to produce analog signals
ICP: Input capture pin is used for pulse measurement of timers
Serial Communication ports: MOSI, MOSI, UART ports, an Inter-Integrated Circuit (I2C) interface, which included Serial Data line(SDA) and Serial Clock line(SCL), are used for serial data transmission
FB: A fault brake circuit to provide motor control to the controller

N76E003AT20 Features and Specifications

Features and Peripherals	Availability
Architecture	8051
Pin Count	20
SRAM	256 Bytes
Watchdog Timer	Yes
Program Memory	18 KiloBytes
Low-speed Internal Oscillator	10 kHz
Internal Oscillator	16 MHz
ADC Resolution	12 bit
ADC	1
DAC	No
Window watchdog timer (WWDT)	No
SPI	1
PWM channels	5
PWM Resolution	16 bit
Number of Timers(16-bit)	2
12C module	1
UART module	2
Interrupt pins	2
Operating Voltage	2.4 – 5.5 Volts
Operational Temperature	-40 – 105⁰C

DataBus Width : 8bits
Pin Count: 20 (TSSOP)
Program Memory: 18 KB
StaticRAM: 256 bytes
I2C Data Rate: 400 kbps
Max SPI Data Rate: 8Mbps

N76E003AT20 Peripheral Features

Some of the peripheral features are detailed below:

CMOS based high-speed microcontroller with Flash memory
It comes with two power-down modes, i.e., Idle mode and power-down mode
It has a code lock for the security purposes
An in-built wake-up timer to work in power saving modes
A Brownout Detection Circuit to monitor and solve power problems
It has two interrupts and timers
Integrated IAP(In-Application Programming) to update the memory through application
Integrated ISP(In-System Programming) and ICP(In-Circuit Programming) to reprogram the memory while installed in the system
A user-programmable watchdog timer with 10 kHz RC Oscillator
An auto-reload timer3 to serve baud rates for UARTs

N76E003AT20 Block Diagram

The block diagram of the microcontroller unit showing the processor and memory is shown below:

N76E003AT20 Microcontroller block diagram

How to Program N76E003AT20 Microcontroller Unit

To program the Nuvoton N76E003AT20 microcontroller, we need an integrated development environment and a compiler. Different software and compilers available in the market can be used to program these 8051 base microcontrollers. But Keil vision is the most widely used IDE that comes with a C51 compiler to program 8051 based microcontrollers.

N76E00AT20 can be programmed through:

IDE: Keil u-vision
Compiler: C51

Download the Keil u-vision free version from the official page and install it on the computer. You can check these getting started guide on Keil uvision:

How to Interface the Microcontroller unit?

The interfacing of the Nuvoton MCU is easy. Following are the steps:

Connect the microcontroller unit
Connect the peripherals
Select the serial communication port
Upload the program
Observe the results

The following figure shows the schematic diagram of a development board based on the N76E003AT20 microcontroller.

Alternate Options

AT89C2051
AT89LP2052
N76E003AS20

N76E003AT20 Applications

Sensor Systems
Audio Controllers
Home automation systems
Low-cost embedded systems
Data Access Control

2D Diagram

The N76E003AT20 Microcontroller Unit comes in the TSSOP-20 package. The following figure shows dimensions of N76E003AT20 Microcontroller Unit. The physical dimensions are used when a PCB card is designed.