
Application Note
AN1060 — Rev. 1.0
MOTOROLA
227
jumper must be installed across J3 to configure the master MCU for 
bootstrap mode. 
One MC68HC711E9 is first programmed by other means with a desired 
12-Kbyte program in its EPROM and a small duplicator program in its 
EEPROM. Alternately, the ROM program in an MC68HC11E9 can be 
copied into the EPROM of a target MC68HC711E9 by programming only 
the duplicator program into the EEPROM of the master MC68HC11E9. 
The master MCU is installed in the EVBU at socket U3. A blank 
MC68HC711E9 to be programmed is placed in the socket in the wire-
wrap area of the EVBU (U6). 
With the V
PP
 power switch off, power is applied to the EVBU system. As 
power is applied to the EVBU, the master MCU (U3) comes out of reset 
in bootstrap mode. Target MCU (U6) is held in reset by the PB7 output 
of master MCU (U3). The PB7 output of U3 is forced to 0 when U3 is 
reset. The master MCU will later release the reset signal to the target 
MCU under software control. The RxD and TxD pins of the target MCU 
(U6) are high-impedance inputs while U6 is in reset so they will not affect 
the TxD and RxD signals of the master MCU (U3) while U3 is coming out 
of reset. Since the target MCU is being held in reset with MODA and 
MODB at 0, it is configured for the PROG EPROM emulation mode, and 
PB7 is the output enable signal for the EPROM data I/O (input/output) 
pins. Pullup resistor R7 causes the port D pins, including RxD and TxD, 
to remain in the high-impedance state so they do not interfere with the 
RxD and TxD pins of the master MCU as it comes out of reset. 
As U3 leaves reset, its mode pins select bootstrap mode so the 
bootloader firmware begins executing. A break is sent out the TxD pin of 
U3. Pullup resistor R10 and resistor R9 cause the break character to be 
seen at the RxD pin of U3. The bootloader performs a jump to the start 
of EEPROM in the master MCU (U3) and starts executing the duplicator 
program. This sequence demonstrates how to use bootstrap mode to 
pass control to the start of EEPROM after reset. 
The complete listing for the duplicator program in the EEPROM of the 
master MCU is provided in 
Listing 1. MCU-to-MCU Duplicator 
Program
. 
F
Freescale Semiconductor, Inc.
For More Information On This Product,
  Go to: www.freescale.com
n
.