ARM Cortex M0 LPC1114 Pinout and Overview-EEWORLD

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We take LQFP48 package as an example.

From the description of the pins in the figure, we can see that almost every pin has multiple functions. For example, pin 9: PIO1_8/CT16B1_CAP0, which means that pin 9 can be used as a general input and output pin P1.8, and can also be used as a capture pin of 16-bit timer 1. (For what is a capture pin, please see Ration's "RATION LPC1114 Basic Manual").

The function of the pin needs to be configured through the IOCON module.
Now, let's go through all the pin descriptions! After reading the pin descriptions, you will have a basic understanding of it.

GPIO module pins:
PIO0_0~PIO0~11
PIO1_0~PIO1~11
PIO2_0~PIO2_11
PIO3_0~PIO3_5

P0, P1, P2 each have 12 pins, P3 has 6 pins, a total of 42 GPIO ports.

Power supply pin: (3.3V power supply)
PIN5: VSS
PIN8: VDD
PIN41: VSS
PIN44: VDD

Clock oscillator pin:
PIN6: XTALIN
PIN7: XTALOUT
connect to external crystal oscillator.

Clock output pin:
PIN4: CLKOUT

Reset pin:
PIN3: RESET

I2C module pin:
PIN15: SCL
PIN16: SDA

UART serial port pin:
PIN46: RXD serial data input pin
PIN47: TXD serial data output pin

In addition to the RXD and TXD pins, there are other handshake signal pins in the 9-pin full-function serial port.
PIN45: RTS
PIN2, PIN36: DTR
PIN23: CTS
PIN13PIN37: DSR
PIN26PIN43: DCD
PIN38PIN48: RI
Among them, the DTR, DSR, DCD, and RI pins are multiplexed on two pins. You can choose a pin as the corresponding function according to actual needs.

SPI module pins: (LPC1114 has 2 SPI modules inside, represented by SPI0 and SPI1 respectively)
PIN10: SSEL0
PIN27: MISO0
PIN28: MOSI0
PIN22PIN29: SCK0

PIN2: SSEL1
PIN26: MISO1
PIN38: MOSI1
PIN13: SCK1
SCK0 is multiplexed on two pins and can be configured to one of the pins through the IOCON_LOC register.

ADC module pins:
PIN32: AD0
PIN33: AD1
PIN34: AD2
PIN35: AD3
PIN39: AD4
PIN40: AD5
PIN30: AD6
PIN42: AD7
LPC1114 has an ADC module inside, which can collect analog signals through 8 pins.
General timer module pins: (a total of 4 timers, 2 16-bit timers, 2 32-bit timers)
PIN10: CT16B0CAP0
PIN27: CT16B0MAT0
PIN28: CT16B0MAT1
PIN29: CT16B0MAT2
"16-bit timer 0" has a capture pin and 3 match output pins.

PIN9: CT16B1CAP0
PIN17: CT16B1MAT0
PIN30: CT16B1MAT1
"16-bit timer 1" has a capture pin and 2 match output pins.

PIN45: CT32B0CAP0
PIN46: CT32B0MAT0
PIN47: CT32B0MAT1
PIN4: CT32B0MAT2
PIN32: CT32B0MAT3
"32-bit timer 0" has one capture pin and four match output pins.

PIN33: CT32B1CAP0
PIN34: CT32B1MAT0
PIN35: CT32B1MAT1
PIN39: CT32B1MAT2
PIN40: CT32B1MAT3
"32-bit timer 1" has one capture pin and four match output pins .

The capture pin can count and measure frequency, similar to a normal interrupt pin.
The match output pin can output a PWM pulse width modulation signal.

SWD debug module pin:
PIN29: SWCLK
PIN39: SWDIO

Above, all the pin names are classified. The functional modules mentioned above all have pins displayed externally. Inside LPC1114, there are also modules that do not have pins displayed externally, such as power management module, watchdog module, etc.

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