MC68HRC908JK3CP Freescale Semiconductor, MC68HRC908JK3CP Datasheet - Page 108

• Manufacturer Part Number: MC68HRC908JK3CP
• Description: IC MCU FLASH 8B 8MHZ RC 4K 20DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HRC908JK3CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 12x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Connectivity: -

Monitor ROM (MON)
Technical Data
106
Enter monitor mode with the pin configuration shown above by pulling
RST low and then high. The rising edge of RST latches monitor mode.
Once monitor mode is latched, the values on the specified pins can
change.
Once out of reset, the MCU waits for the host to send eight security
bytes. (See
break signal (10 consecutive logic zeros) to the host, 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.
In monitor mode, the MCU uses different 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.
Figure 9-2. Low-Voltage Monitor Mode Entry Flowchart
9.5
Monitor ROM (MON)
Security.) After the security bytes, the MCU sends a
MONITOR MODE
TRIGGERED?
POR RESET
IS VECTOR
EXECUTE
MONITOR
BLANK?
CODE
POR
YES
YES
NO
NO
NORMAL USER
MC68H(R)C908JL3
MODE
Freescale Semiconductor
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Rev. 1.1