This page provides a description of each pin according to the various interfaces provided by the P4M-400. Unused pins do not need to be connected except when special mention is made in this page.
+3.3V
Input the power supply of 3.3V DC to this pin. Make sure the DC voltage is in the range of 3.15V ~ 3.45V. It is recommended to use a power supply capable of supplying more than 500mA current while stable output of DC 3.3V for the stable operation of the module.
GND
Connect the ground of your main system to this pin. It is recommended that the ground is as wide as possible to shorten the path of return signal.
RESET#
This pin is used to restart the system. If you enter a LOW pulse of 1 millisecond (1ms) or more to this pin, the system will restart. Since this pin is LOW Active, normally it should be pulled up with 100K ohm resistance and keep it high state.
ISP#
ISP # is the pin used to put the product into ISP mode. Since this pin is LOW Active, normally it should be pulled up with 100K ohm resistance and keep it high state.
※ ISP mode is a necessary mode for system maintenance such as Escaping infinite reset state.
VBAT
Connect the battery to VBAT so that the built-in RTC time information and back up SRAM contents are not erased when power is not applied. Connect this pin to +3.3V if you do not use any battery. The allowable voltage is DC 1.65V to DC 3.6V.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P1.3 | TPTX+ | In/Out | Ethernet Transmit + |
| P1.4 | TPTX- | In/Out | Ethernet Transmit - |
| P1.5 | TPRX+ | In/Out | Ethernet Receive + |
| P1.6 | TPRX- | In/Out | Ethernet Receive - |
P4M-400 provides 10/100Base-TX Ethernet Interface. Note that RJ45 connector is required to use Ethernet.
Refer to a circuit diagram of the Application Circuit Diagram for the connection.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P1.9 | USB_H_D+ | In/Out | USB Host Data + |
| P1.10 | USB_H_D- | In/Out | USB Host Data - |
P4M-400 provides IEEE802.11b/g wireless LAN via USB host port using a wireless LAN dongle which embeds RT3070 or RT5370 chipset. The USB host port must be connected to USB type A connector. Refer to a circuit diagram of the Application Circuit Diagram for the connection.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P1.11 | USB_D_D+ | In/Out | USB Device Data + |
| P1.12 | USB_D_D- | In/Out | USB Device Data - |
| P2.1 | VBUS | In | USB Device VBUS |
This port must be interfaced for product development and configuration. After connecting this port and connecting the product with PC via a USB cable, you can access the product using the development tool (PHPoC Debugger). Either type B USB connector, mini USB or micro USB connector can be used for this port.
※ Note: The VBUS pin cannot be used for supplying power to P4M-400.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P3.1 | NSS(0.0) | In/Out | UIO 0.0 / SPI NSS |
| P3.2 | SCK(0.1) | In/Out | UIO 0.1 / SPI SCK |
| P3.3 | MISO(0.2) | In/Out | UIO 0.2 / SPI MISO |
| P3.4 | MOSI(0.3) | In/Out | UIO 0.3 / SPI MOSI |
| P3.5 | U0TX(0.4) | In/Out | UIO 0.4 / UART0 TX |
| P3.6 | U0RX(0.5) | In/Out | UIO 0.5 / UART0 RX |
| P3.7 | SCL(0.6) | In/Out | UIO 0.6 / I2C SCL |
| P3.8 | SDA(0.7) | In/Out | UIO 0.7 / I2C SDA |
| P3.9 | U0RTS(0.8) | In/Out | UIO 0.8 / UART0 RTS / UART0 TxDE |
| P3.10 | U0CTS(0.9) | In/Out | UIO 0.9 / UART0 CTS |
| P3.11 | U1TX(0.10) | In/Out | UIO 0.10 / UART1 TX |
| P3.12 | U1RX(0.11) | In/Out | UIO 0.11 / UART1 RX |
| P4.1 | U1RTS(0.12) | In/Out | UIO 0.12 / UART1 RTS / UART1 TxDE |
| P4.2 | U1CTS(0.13) | In/Out | UIO 0.13 / UART1 CTS |
| P2.7 | UIO(0.14) | In/Out | UIO 0.14 |
| P2.8 | SRO(0.15) | In/Out | UIO 0.15 / Slave Reset Out |
| P4.9 | ADC0(1.0) | In/Out | UIO 1.0 / ADC0 |
| P4.10 | ADC1(1.1) | In/Out | UIO 1.1 / ADC1 |
| P4.11 | ADC2(1.2) | In/Out | UIO 1.2 / ADC2 |
| P4.12 | ADC3(1.3) | In/Out | UIO 1.3 / ADC3 |
| P2.3 | HT0(1.6) | In/Out | UIO 1.6 / Hardware Timer/Counter 0 |
| P2.4 | HT1(1.7) | In/Out | UIO 1.7 / Hardware Timer/Counter 1 |
| P2.5 | HT2(1.8) | In/Out | UIO 1.8 / Hardware Timer/Counter 2 |
| P2.6 | HT3(1.9) | In/Out | UIO 1.9 / Hardware Timer/Counter 3 |
| P4.3 | STX(1.10) | In/Out | UIO 1.10 / Slave TX |
| P4.4 | SRX(1.11) | In/Out | UIO 1.11 / Slave RX |
Analog input, UART, SPI and I2C ports can be set or used to digital I/O pins. These ports are mapped to UIO 0 and UIO 1. Digital I/O ports can also be operated as output ports of ST(Software Timer).
| Parameter | Description | Min.[V] | Max.[V] | Current |
|---|---|---|---|---|
| VIH | HIGH level input | 2.31 | - | - |
| VIL | LOW level input | 0 | 0.99 | - |
| VOH | HIGH level output | 2.9 | - | ±8mA(CMOS) |
| VOH | HIGH level output | 2.4 | - | ±8mA(TTL) |
| VOL | LOW level output | - | 0.4 | ±8mA(CMOS/TTL) |
※ Note: Each UIO port is 5V tolerant in input mode and the maximum driving current is ±8mA in output mode.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P4.8 | AREF | In | ADC Reference Input |
| P4.9 | ADC0(1.0) | In/Out | UIO 1.0 / ADC0 |
| P4.10 | ADC1(1.1) | In/Out | UIO 1.1 / ADC1 |
| P4.11 | ADC2(1.2) | In/Out | UIO 1.2 / ADC2 |
| P4.12 | ADC3(1.3) | In/Out | UIO 1.3 / ADC3 |
ADC0, ADC1, ADC2 and ADC3 pins are analog input ports and each port has 12-bit resolution. The measured voltage of each port depends on a reference voltage. (0 ~ reference voltage) The reference voltage is input to the AREF pin, and the range of allowable voltage is DC 2.1V to DC 3.3V.
※ Note: The AREF pin must be connected regardless of whether the analog input port is used or not.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P3.5 | U0TX(0.4) | In/Out | UIO 0.4 / UART0 TX |
| P3.6 | U0RX(0.5) | In/Out | UIO 0.5 / UART0 RX |
| P3.9 | U0RTS(0.8) | In/Out | UIO 0.8 / UART0 RTS / UART0 TxDE |
| P3.10 | U0CTS(0.9) | In/Out | UIO 0.9 / UART0 CTS |
| P3.11 | U1TX(0.10) | In/Out | UIO 0.10 / UART1 TX |
| P3.12 | U1RX(0.11) | In/Out | UIO 0.11 / UART1 RX |
| P4.1 | U1RTS(0.12) | In/Out | UIO 0.12 / UART1 RTS / UART1 TxDE |
| P4.2 | U1CTS(0.13) | In/Out | UIO 0.13 / UART1 CTS |
There are two UART ports and each of them has RXD, TXD, RTS, CTS and TxDE.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P3.1 | NSS(0.0) | In/Out | UIO 0.0 / SPI NSS |
| P3.2 | SCK(0.1) | In/Out | UIO 0.1 / SPI SCK |
| P3.3 | MISO(0.2) | In/Out | UIO 0.2 / SPI MISO |
| P3.4 | MOSI(0.3) | In/Out | UIO 0.3 / SPI MOSI |
There is SPI port which has NSS, SCK, MISO and MOSI.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P3.7 | SCL(0.6) | In/Out | UIO 0.6 / I2C SCL |
| P3.8 | SDA(0.7) | In/Out | UIO 0.7 / I2C SDA |
There is I2C port which has SCL and SDA.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P2.3 | HT0(1.6) | In/Out | UIO 1.6 / Hardware Timer/Counter 0 |
| P2.4 | HT1(1.7) | In/Out | UIO 1.7 / Hardware Timer/Counter 1 |
| P2.5 | HT2(1.8) | In/Out | UIO 1.8 / Hardware Timer/Counter 2 |
| P2.6 | HT3(1.9) | In/Out | UIO 1.9 / Hardware Timer/Counter 3 |
There are four precision hardware timer/counters.
| Pin# | Name | I/O | Description |
|---|---|---|---|
| P2.8 | SRO(0.15) | Out | UIO 0.15 / Slave Reset Out |
| P4.3 | STX(1.10) | Out | UIO 1.10 / Slave TX |
| P4.4 | SRX(1.11) | In | UIO 1.11 / Slave RX |
P4M-400 does not support SPC yet. These pins are only allowed to set digital I/O ports.
※ Note: The SPC port can be used for other purposes in the future.