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Engineering Bulletin
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In-Circuit Programming of FLASH Memory Using
the Monitor Mode for the MC68HC908SR12
By Timothy J. Airaudi
Applications Engineering, Microcontroller Division
Austin, Texas
Introduction
This engineering bulletin describes how to perform in-circuit
programming (ICP) of the FLASH memory using monitor mode for the
MC68HC908SR12.
Two ICP methods are discussed here:
•
•
Using the M68ICS08SR in-circuit simulator (ICS) with P&E
Microcomputer Systems software
Using P&E Microcomputer Systems software with an external
communications circuit
ICP is a process where user code is programmed into the device’s
FLASH memory after the part has been assembled into the application.
ICP also allows the original users code to be erased and
re-programmed. This method can be used in development,
production/manufacturing, and in a field environment.
P&E is a trademark of P&E Microcomputer Systems, Inc.
© Motorola, Inc., 2001
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Engineering Bulletin
Using Monitor Mode for FLASH Programming
Motorola’s current solution for ICP is the in-circuit simulators and P&E’s
software.
The software and ICS allow programming of the parts on the simulator
or in the target circuit via a MON08 ribbon cable. The software also
allows programming of the part, without the ICS, by using an external
communications circuit.
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All the programming described here is accomplished by placing the part
into monitor mode. In this mode, erasing and programming are done
through a single-wire interface with the host computer.
The two ways to enter monitor mode are:
•
The ICS provides the entry requirements into standard monitor
mode. These entry requirements must be implemented on the
target board if the ICS is not used.
A second way to enter monitor mode, that does not require a high
voltage on the IRQ1 pin, is forced monitor mode. This mode does
not need to meet all the monitor mode entry conditions of the
standard monitor mode, but it does require the part to be blank
(erased).
•
This engineering bulletin describes how to connect the part,
communicate at different baud rates, place the part into monitor mode,
pass security, and erase and program the part. If the security code is not
known, the contents of the FLASH can’t be read, but the FLASH can be
erased and reprogrammed.
Information on the M68ICS08SR can be found at
http://www.motorola.com/semiconductors, the company’s Web site.
P&E Microcomputer Systems software can be downloaded free from
that company’s Web site.
NOTE:
All of the oscillators used in this engineering bulletin are the 4-pin
“powered” or “canned” type oscillators. Discussing all the different
vendors of crystals, ceramic oscillators, other required external
components, and component layout variables would be too extensive.
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Freescale Semiconductor, Inc.
Engineering Bulletin
Using Monitor Mode for FLASH Programming
ICP Using
M68ICS08SR’s
MON08 Interface
Use this procedure for performing ICP using the ICS’s MON08 cable to
the target application.
1. Materials required:
a. PC with P&E’s software installed
b. M68ICS08SR ICS
c.
Adapter/connector to connect the female end of the MON08
cable to the target application
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d. Pin assignment diagram (see
Figure 1
and
Figure 2)
e. Monitor mode entry requirements (see
Table 1)
f.
Crystal oscillator on the target or from an external clock
source with a value from
Table 2
g. Target board must have the ability to perform a power-on
reset (POR) not just a reset (required to enter monitor mode).
2. Connections (see
Figure 3):
a. 9-pin serial cable from PC to the ICS
b. 5 volts to the ICS
c.
MON08 cable (even pins) from J3 of the ICS to the target
board with these connections:
– MON08 GND to the V
SS
pin on the part
– MON08 RST to the RST pin on the part
– MON08 IRQ to the IRQ1 pin on the part
– MON08 PTA0 to the PTA0 pin on the part
– MON08 PTA2 to the PTA2 pin on the part
– MON08 PTA1 to the PTA1 pin on the part
– MON08 PTC1 to the PTC1 pin on the part
d. It is assumed that all V
DD
and V
SS
pins on the part are already
connected.
3. Operation — Standard monitor mode entry:
a. Launch P&E’s WINIDE in the ICS08SRZ software.
b. Open desired file. (Demo file can be used for testing
purposes.)
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c.
Assemble/Compile the file (see
Figure 7).
d. Plug in power to the ICS.
e. Apply power to the target.
f.
Launch the programmer.
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g. From “Target Hardware Type,” select “Class II” (see
Figure 8).
If this window does not appear and the window in
Figure 9
appears instead, you should relaunch the
programmer without applying power to the target. You may
want to check the “Show this dialog before attempting to
contact the target 68HC08 board.”
h. From “PC Serial Port Configuration,” select the PC port you
are using and the appropriate baud rate (see
Table 2).
i.
j.
k.
l.
From “Target MCU Security Bytes,” select appropriate
security code (blank part = FF).
Select “Contact Target with these Settings…”
Follow the instructions in the “Power Down/Up Dialog”
windows.
Select appropriate algorithm for the part. The high-speed
algorithm will not work at 14.4 and 28.8 kbaud.
m. Double click on “Erase Module” – EM (see
Figure 9).
n. Double click on “Program Module” – PM.
o. Record security bytes. This information can be seen by
quitting and then re-entering the programmer. The S19 record
will have the same security bytes as the part just programmed
as long as it is not changed. The security bytes consist of the
information stored in the interrupt vectors, $FFF6–$FFFD.
4. Operation — Forced monitor mode entry:
Forced monitor mode is not supported by this ICS. However,
this mode can be entered by using the procedure found in
ICP
Using the External Communications Circuit (No ICS).
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Engineering Bulletin
Using Monitor Mode for FLASH Programming
ICP Using
the External
Communications
Circuit (No ICS)
Use this procedure for performing ICP via an external communications
circuit in place of this ICS to the target application.
1. Materials required:
a. PC with P&E software installed
b. Adapter/connector to connect the male end of the 9-pin serial
cable to the target application
c.
The external communications circuit. Also needed is a 5-volt
power source to power this circuit (see
Figure 4, Figure 5,
and
Figure 6).
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d. Pin assignment diagram (see
Figure 1
and
Figure 2)
e. Monitor mode entry requirements (see
Table 1)
f.
Crystal oscillator on the target or from an external clock
source, with a value from
Table 2.
If the crystal oscillator in the
target application is not a value listed in
Table 2,
it may be
possible to “overdrive” the target crystal with an external clock.
An example of this would be overdriving a target’s 32.768-kHz
crystal with a 9.8304-MHz external clock.
g. Target board must have the ability to perform a POR not just
a reset of the part (required to enter monitor mode).
2. Connections (see
Figure 4):
a. 9-pin serial cable from PC to the external communications
circuit
b. V+ pin of the RS-232 part to the IRQ1 pin of the part
c.
Communication pin of HC125 to PTA0 of the part
d. Target pin requirements:
– PTA2 of the part to V
SS
– PTA1 of the part to V
DD
via a pullup resistor
– PTC1 of the part to V
SS
(crystal frequency
÷
2) or to V
DD
via a pullup resistor (crystal frequency
÷
4). See
Table 2.
– RESET has an internal pullup resistor.
e. It is assumed that all V
DD
and V
SS
pins on the part are already
connected.
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