XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 212

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

Monitor ROM (MON)
14.4.1 Entering Monitor Mode
Technical Data
212
NOTE:
Table 14-1
Enter monitor mode by either
Once out of reset, the MCU waits for the host to send eight security bytes
(see
break signal (10 consecutive logic 0s) to the host computer, indicating
that it is ready to receive a command.
Monitor mode uses alternate vectors for reset, SWI, and break interrupt.
The alternate vectors are in the $FE page instead of the $FF page and
allow code execution from the internal monitor firmware instead of user
code. The COP module is disabled in monitor mode as long as V
5.0 Volt DC Electrical Characteristics
either the IRQ pin or the RESET pin. (See
(SIM)
Holding the PTC3 pin low when entering monitor mode causes a bypass
of a divide-by-two stage at the oscillator. The CGMOUT frequency is
equal to the CGMXCLK frequency, and the OSC1 input directly
generates internal bus clocks. In this case, the OSC1 signal must have
a 50% duty cycle at maximum bus frequency.
1. For V
page 530.
•
•
V
V
HI
HI
Security
(1)
(1)
Executing a software interrupt instruction (SWI) or
Applying a logic 0 and then a logic 1 to the RST pin.
on page 147 for more information on modes of operation).
HI
,
5.0 Volt DC Electrical Characteristics
1
1
shows the pin conditions for entering monitor mode.
on page 220). After the security bytes, the MCU sends a
0
0
Monitor ROM (MON)
1
1
Table 14-1. Mode Selection
1
0
Monitor
Monitor
Mode
CGMXCLK
---------------------------- -
2
on page 532, and
on page 532), is applied to
CGMXCLK
CGMOUT
System Integration Module
or
MC68HC908AZ60A — Rev 2.0
CGMVCLK
---------------------------- -
2
Maximum Ratings
Frequency
MOTOROLA
CGMOUT
------------------------- -
CGMOUT
------------------------- -
Bus
HI
2
2
(see
on