MC68HC705P9 Datasheet, PDF (29/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Memory
EPROM/OTPROM
The logical states of the PC4/AN2 and PC3/AN3 pins select the
bootloader function, as Table 1 shows.
Table 1. Bootloader Function Selection
PC4/AN2
1
1
PC3/AN3
1
0
Function
Program and Verify
Verify Only
Complete the following steps to bootload the MCU:
CAUTION:
1. Turn off all power to the circuit.
2. Install the EPROM containing the code to be downloaded.
3. Install the MCU.
4. Select the bootloader function:
a. Open switches S2 and S3 to select the program and verify
function.
b. Open only switch S2 to select only the verify function.
5. Close switch S1.
6. Turn on the V_DD power supply.
Turn on the V_DD power supply before turning on the V_PP power supply.
7. Turn on the V_PP power supply.
8. Open switch S1. The bootloader code begins to execute. If the
PROGRAM function is selected, the PROGRAM LED turns on
during programming. If the VERIFY function is selected, the
VERIFY LED turns on when verification is successful. The
PROGRAM and VERIFY functions take about 10 seconds.
9. Close switch S1.
10. Turn off the V_PP power supply.
11-mc68hc705p9
MOTOROLA
Memory
29