Renesas Single-Chip Microcomputer SH7203 Información técnica descargar pdf (Pagina 11)

Chapter 6. User Circuitry

6.1. Switches

There are four switches located on the CPU board. The function of each switch and its connection are shown in Table 6-1.

Switch Function Microcontroller

RES When pressed; the CPU board microcontroller is reset. RESn, Pin 59

SW1* Connects to an IRQ input for user controls. SW6-8 needs to be ON. IRQ0, Pin 179

(Port B, bit 0)

SW2* Connects to an IRQ line for user controls. SW6-5 needs to be ON. IRQ1, Pin 180

(Port B, bit 1)

SW3* Connects to an IRQ line for user controls. SW6-3 needs to be ON. IRQ2, Pin 181

(Port B, bit 2)

* - Please refer to Table 6-25 to Table 6-27 for details on DIP switch settings.

Table 6-1 Switch Functions

6.2. LEDs

There are 6 LEDs on the CPU board. The green ‘POWER’ LED lights when the board is powered. The four user LEDs are connected to an

IO port and will light when their corresponding port pin is set low. An Orange LED “LED4” will lit when the Ethernet link operates in Full

Duplex mode.

Table 6-2 below, shows the LED pin references and their corresponding microcontroller port pin connections.

LED Reference (As shown

on silkscreen)

Microcontroller Port Pin function Microcontroller Pin Number Polarity

LED0 Port E bit 10 71 Active Low

LED1* Port E bit 12 73 Active Low

LED2* Port C bit 14 75 Active Low

LED3* Port E bit 11 72 Active Low

* - Please refer to Table 6-13, Table 6-20 and Table 6-21 for details on DIP switch settings.

Table 6-2 LED Ports

6.3. Potentiometer

A single turn potentiometer is connected to AN0 of the microcontroller via an option resistor ‘R67’ (which is fitted by default). This may be

used to vary the input analog voltage value to this pin between AVCC and Ground.

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Renesas Single-Chip Microcomputer SH7203 Información técnica Pagina 11