HC705J2 datasheet(65/78 Pages) MOTOROLA

65 / 78 page

MC68HC705J2

BOOTLOADER

MODE

MOTOROLA

8-3

Complete the following steps to bootload the MCU:

1. Turn off all power to the circuit.

2. Install the MCU and the EPROM.

3. Select the MCU mode:

a. Install a jumper between points 2 and 3 to program the MCU as an

MC68HC705J2.

b. Install a jumper between points 1 and 2 to program the MCU as an

MC68HC05J1.

4. Select the bootloader function:

a. Open switch S2 to select the program and verify function.

b. Close switch S2 to select the verify only function.

5. Close switch S1 to reset the MCU.

6. Apply VDD to the circuit.

7. Apply the EPROM programming voltage, VPP, to the circuit.

8. Open switch S1 to take the MCU out of reset. During programming the

PROGRAM LED turns on. It turns off when the verification routine begins.

If verification is successful, the VERIFY LED turns on. If the bootloader

finds an error during verification, it puts the error address on the external

address bus and stops running.

9. Close switch S1 to reset the MCU.

10. Remove the VPP voltage.

11. Remove the VDD voltage.

8.2 Host Downloading

The MC68HC05P8EVS board supports downloading user programs directly

from a personal computer.

Refer to MC68HC05P8EVS Customer Specified

Integrated Circuit (CSIC) Evaluation System, Motorola document number

BR735/D.

HC705J2 Datasheet(PDF) 65 Page - Motorola, Inc