MC68HC908AB32CFU Freescale Semiconductor, MC68HC908AB32CFU Datasheet - Page 160
MC68HC908AB32CFU
Manufacturer Part Number
MC68HC908AB32CFU
Description
IC MCU 8MHZ 32K FLASH 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AB32CFUE.pdf
(392 pages)
Specifications of MC68HC908AB32CFU
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
SCI, SPI
Peripherals
POR, PWM
Number Of I /o
51
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Monitor ROM (MON)
10.4.1 Entering Monitor Mode
Technical Data
160
NOTE:
Table 10-1
Enter monitor mode by either
The MCU sends a break signal (10 consecutive logic 0s) to the host
computer, indicating that it is ready to receive a command. The break
signal also provides a timing reference to allow the host to determine the
necessary baud rate.
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
Section 23. Electrical
or the RST pin. (See
more information on modes of operation.)
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.
Notes:
1. For V
•
•
IRQ Pin
V
V
TST
Executing a software interrupt instruction (SWI) or
Applying a logic 0 and then a logic 1 to the RST pin.
TST
TST
(1)
, see
shows the pin conditions for entering monitor mode.
Table 10-1. Monitor Mode Entry Conditions
Section 23. Electrical
Monitor ROM (MON)
1
1
Section 8. System Integration Module (SIM)
0
0
Specifications) is applied to either the IRQ pin
1
1
Specifications.
1
0
CGMXCLK ÷ 2
CGMVCLK ÷ 2
CGMXCLK
CGMOUT
or
MC68HC908AB32
Freescale Semiconductor
Bus Frequency
(CGMOUT ÷ 2)
CGMXCLK ÷ 4
CGMVCLK ÷ 4
CGMXCLK ÷ 2
or
TST
—
Rev. 1.1
(see
for
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