Renesas EDK3687 User Interface, EDK Operation, Serial Interface, Connector PIN Definitions

4.EDK OPERATION

4.1. USER INTERFACE

The EDK provides two buttons for influencing the operation of the board. The purpose of each button is clearly marked next to it. Refer to the board layout for positions (Section 3)

1.Reset Switch

This button provides the microcontroller with a reset pulse utilizing the built in power on reset control of the device.

2.NMI Switch

This button provides a de-bounced signal to the microcontroller for each operation of the button. There is no maximum activation time for this button.

4.2.SERIAL INTERFACE

The serial port on the microcontroller directly supports three wire serial interfaces. Options are provided on the board for the user to write handshaking routines using standard port pins.

4.2.1.CONNECTOR PIN DEFINITIONS

The EDK RS232 interface conforms to Data Communication Equipment (DCE) format allowing the use of 1-1 cables when connected to Data Terminal Equipment (DTE) such as an IBM PC. The cable used to connect to the EDK will affect the available board options. A fully wired cable can allow handshaking between the microcontroller and the host PC, subject to setting the board options and the availability of suitable host software. Handshaking is not supported as standard on the microcontroller so for normal use a minimal three-wire cable can be used. The minimum connections are unshaded in the following table.

EDK DB9	Signal	Host DB9
Connector Pin		Connector Pin
1	No Connection	1
2	EDK Tx Host Rx	2
3	EDK Rx Host Tx	3
4	No Connection	4
5	Ground	5
6	No Connection	6
7	EDK CTS Host RTS	7
8	EDK RTS Host CTS	8
9	No Connection	9

TABLE 4-1: RS232 INTERFACE CONNECTIONS
5	4	3	2	1
9	8	7		6
FIGURE 4-1: EDK SERIAL PORT PIN NUMBERING

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