M68KIT912D60A Datasheet M68KIT912D60A | P4-P6

M68EVB912D60/D

M68EVB912D60/D 4

1. Introduction

This manual provides the necessary information for using the M68EVB912D60 Evaluation Board (EVB), an

evaluation and debugging tool for the MC68HC912D60 Microcontroller Unit (MCU) device. The manual includes

a general description of the EVB as well as configuration and set-up instructions

2. General Description and Features

The EVB can be used in conjunction with an appropriate debugger tool that uses the background debug mode,

such as Motorola’s (or Noral’s) Serial Debug Interface (SDI), and compatible debug software such as Motorola’s

MCUez or P&E’s SDBUG12.

The board consists of a 4 layer PCB which provides the interface and power connections to the MC68HC912D60

microcontroller (MCU).

Hardware features include the following:

• Single 5 V dc power supply connector

• RS-232C Interface

• BDM In connector providing interface to Background Debug Mode

• 16 MHz oscillator module

• Prototype expansion area for customised interfacing with the MCU

• Low-voltage inhibit protection

• CAN Physical Interface

• Chargepump for the supply of the flash programming voltage

• Bargraph LED to assist with debugging

• 8 way DIP switch to assist with debugging

The EVB is factory configured to start in single chip or special single chip mode. It is supplied with the flash

EEPROM unprogrammed and can be run with an appropriate debugger, via the Background Debug Mode (BDM)

interface.

The EVB features a prototype area, which allows custom interfacing with the MCU’s I/O and bus lines. The MCU

pins can be accessed via header footprints immediately adjacent to the MCU.

An on-board push-button switch, S2, allows the EVB hardware to be manually reset.

A CAN physical interface is provided on the board. This comprises of a Philips PCA82C250 CAN Interface

controller.

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3. Hardware Reference

3.1 Power Supply

The EVB requires an external +5 volt power supply for operation. Ideally this should be current limited to 200mA.

Power is supplied to the EVB via the power socket, P6. A 2.5mm power plug has been included in the

M68EVB912D60 kit to allow the user to power the EVB from a standard desktop power supply. To do this the

user should solder insulated wires onto the two terminals of the power plug, and then connect the other ends of

the wires up to their power supply. Great care should be taken to ensure that the 5 Volt supply is connected to

the internal part of the power plug and the Gnd supply is connected to the external barrel of the power plug.

To +5V Supply

To GND Supply

3.2 BDM In Connector

The EVB can be used in conjunction with a suitable Background Debug Mode (BDM) debugger interface, such

as the SDI, and appropriate debugger software. The BDM input to the EVB is via jumper J16. Table 3-1 shows the

pinout for J16.

3.3 MCU Operating Mode

Jumpers J24 and J25 allow the user to select which mode the MCU starts in after reset by controlling the state of

the MODA and MODB pins. The default mode is to pull the MCU MODA and MODB pins to ground. This

results in the MCU starting from reset in either Single Chip or Special Single Chip mode (dependant on the state

of the BKGD pin).

The state of the MODA and MODB pins can also be set via the Noral SDI cable. When this option is used it is

not necessary to install links on jumpers J24 and J25.

3.4 Clock

A 16 MHz oscillator module provides the clock signal to the MCU. Jumper J27 must be installed between pins 1

and 2 (factory default) to configure the clock signal correctly.

3.5 RS-232C Interface

An RS-232C interface is provided on the EVB through a 9 way D type connector, P1. Signal level translation

between the MCU and P1 is provided by an MC145407 RS-232 interface IC (U3) . This is connected to the TxD

and RxD pins of the Serial Communications Interface (SCI) on the MC68HC912D60 via jumpers J11 (TxD) and J9

(RxD). As there are two serial communications interface modules supplied on the MCU, jumpers J9 and J11 can

be used to select between them. The EVB has been configured to act as Data Circuit-terminating Equipment

(DCE). Removing jumpers J8, J10 and J13 allows the user to disable this function if it is not required.

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3.6 CAN Physical Interface

There is a CAN physical interface supplied on the M68EVB912D60. The CAN physical interface comprises a

Philips PCA82C250 CAN Interface controller (U1). The TXD and RXD pins on the PCA82C250 are connected to

the CANTX and CANRX pins on the MC68HC912D60 respectively. The CAN bus signals, CANH and CANL are

available on jumper J1. Table 3-1 shows the pinout for J1.

3.7 Programming Operation

It is possible to configure the M68EVB912D60 as a programming tool. To do this the relevant programming

adapter board has to be purchased (contact Motorola for further details). To configure the EVB as a programming

tool, the adapter board has to be connected to the header strips on the EVB (when doing this care should be

taken to ensure that the adapter board is installed with the correct polarity as failure to do so could result in

damage to the device being programmed). It is also necessary to install the jumpers on header P8 in the PGMR

position.

There are two possible ways of supplying the flash EEPROM programming voltage V

to the MCU, either via the

MAX662 chargepump I.C. (U5), or via the SDI cable. The source of the flash EEPROM programming voltage can

be selected via jumper J17.

There is an option for controlling the operation of the chargepump I.C. (U5). If there is no jumper link installed on

Jumper J14, then the V

supply will be held at the level of V

. If a jumper link is installed on Jumper J14 then 12V

will be supplied to the V

pin of the MCU. In addition to this there is an option which allows the user to control

the operation of the chargepump I.C. via a port pin of their choice. To do this the user must connect a wire

between the pad situated to the right hand side of Jumper J14 and the pad of the port pin they want to use as the

controller. When this option is chosen the user must remove the jumper link from jumper J14.

J14 From user specified port pin

3.8 Jumper Configuration

Table 3-1 summarises the jumper and header configurations for the EVB.

Key to Table 3-1

2 pin header with no jumper installed

2 pin header with jumper installed

3 pin header with jumper installed between pins 1 and 2

3 pin header with jumper installed between pins 2 and 3

3 pin header with no jumper installed

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