Freescale Semiconductor, Inc.
EPROM/OTPROM (PROM)
To program the PROM MCU, the MCU is installed in the PCB, along with
an EPROM device programmed with user code; the MCU is then
subjected to a series of routines. The routines necessary to program,
verify, and secure the PROM MCU are:
• Program and verify PROM
• Verify PROM contents only
• Secure PROM and verify
• Secure PROM and dump through the serial communications
interface (SCI)
Other board routines available to the user are:
• Load program into random-access memory (RAM) and execute
• Execute program in RAM
• Dump PROM contents (binary upload)
The user first configures the MCU for the bootstrap mode of operations
by installing a fabricated jumper across pins 1 and 2 of the board’s mode
select header, J1. Next, the board’s mode switches (S3, S4, S5, and S6)
are set to determine the routine to be executed after the next reset, as
shown in Table 9-2.
Table 9-2. PROM Programming Routines
Routine
Program and verify PROM
S3
Off
Off
On
On
Off
Off
Off
S4
Off
Off
Off
On
On
Off
On
S5
Off
On
On
On
Off
Off
On
S6
Off
Off
Off
Off
Off
On
Off
Verify PROM contents only
Secure PROM contents and verify
Secure PROM contents and dump
Load program into RAM and execute
Execute program in RAM
Dump PROM contents
Technical Data
108
MC68HC705C8A — Rev. 3
EPROM/OTPROM (PROM)
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