MC68HC705J2 Datasheet, PDF (49/82 Pages) Freescale Semiconductor, Inc – member of the low-cost

Freescale Semiconductor, Inc.
Complete the following steps to bootload the MCU:
1. Turn off all power to the circuit.
2. Install the MCU and the EPROM.
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3. Select the MCU mode:
a. Install a jumper between points 2 and 3 to program the MCU as an
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MC68HC705J2.
b. Install a jumper between points 1 and 2 to program the MCU as an
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MC68HC05J1.
4. Select the bootloader function:
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a. Open switch S2 to select the program and verify function.
b. Close switch S2 to select the verify only function.
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5. Close switch S1 to reset the MCU.
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6. Apply V_DD to the circuit.
7. Apply the EPROM programming voltage, V_PP, to the circuit.
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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
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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
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and stops running.
9. Close switch S1 to reset the MCU.
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10. Remove the V_PP voltage.
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11. Remove the V_DD voltage.
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8.2 Host Downloading
The MC68HC05P8EVS board supports downloading user programs directly from a ¹³
personal computer. Refer to MC68HC05P8EVS Customer Specified Integrated
Circuit (CSIC) Evaluation System, Motorola document number BR735/D.
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BOOTLOADER MODE
Rev. 2
8-3
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