Renesas Renasas Single-Chip Microcomputer SH7086 Manuel d'utilisateur télécharger pdf (Page 9)

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 22

SW1/BOOT* Connects to an IRQ input for user controls. IRQ0, Pin 92

(Port B, bit 21)

SW2* Connects to an IRQ line for user controls. IRQ4, Pin 87

(Port B, bit 18)

SW3* Connects to an IRQ line for user controls. Same pin functions as ADC

trigger input.

IRQ6, Pin 88

(Port B, bit 19)

Table 6-1: Switch Functions

*Refer to schematic for detailed connectivity information.

6.2. LEDs

There are six LEDs on the CPU board. The green ‘POWER’ LED lights when the board is powered. The orange BOOT LED indicates the

device is in BOOT mode when lit. The four user LEDs are connected to an IO port and will light when their corresponding port pin is set low.

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 B bit 10 75 Active Low

LED1 Port B bit 11 76 Active Low

LED2 Port B bit 12 79 Active Low

LED3 Port B bit 13 80 Active Low

Table 6-2: LED Port

6.3. Potentiometer

A single turn potentiometer is connected to pin ‘AN0’ of the microcontroller. This may be used to vary the input analog voltage value to this

pin between AVCC and Ground.

6.4. Serial port

The microcontroller programming serial port (SCI1) is connected to the E8 connector. SCI2 is connected to the RS232 connector SERIAL.

SCI1 can optionally be connected to the RS232 transceiver by fitting option resistors. The connections to be fitted are listed in

Table 6-3

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 30 31

Pas de commentaire

Renesas Renasas Single-Chip Microcomputer SH7086 Manuel d'utilisateur Page 9