MCR908JL3ECFAE Freescale Semiconductor, MCR908JL3ECFAE Datasheet - Page 79
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MCR908JL3ECFAE
Manufacturer Part Number
MCR908JL3ECFAE
Description
IC MCU 4K FLASH 8MHZ 48-LQFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908JK1ECDWE.pdf
(180 pages)
Specifications of MCR908JL3ECFAE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LED, LVD, POR, PWM
Number Of I /o
23
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
48-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Connectivity
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCR908JL3ECFAE
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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7.4 Security
A security feature discourages unauthorized reading of Flash locations while in monitor mode. The host
can bypass the security feature at monitor mode entry by sending eight security bytes that match the
bytes at locations $FFF6–$FFFD. Locations $FFF6–$FFFD contain user-defined data.
During monitor mode entry, the MCU waits after the power-on reset for the host to send the eight security
bytes on pin PTB0. If the received bytes match those at locations $FFF6–$FFFD, the host bypasses the
security feature and can read all Flash locations and execute code from Flash. Security remains bypassed
until a power-on reset occurs. If the reset was not a power-on reset, security remains bypassed and
security code entry is not required. (See
Freescale Semiconductor
Description
Operand
Data Returned
Opcode
Command Sequence
Description
Operand
Data Returned
Opcode
Command Sequence
SENT TO
MONITOR
SENT TO
MONITOR
ECHO
ECHO
READSP
RUN
Do not leave locations $FFF6–$FFFD blank. For security reasons, program
locations $FFF6–$FFFD even if they are not used for vectors.
Reads stack pointer
None
Returns stack pointer in high byte:low byte order
$0C
Executes RTI instruction
None
None
$28
READSP
Table 7-8. READSP (Read Stack Pointer) Command
RUN
Table 7-9. RUN (Run User Program) Command
MC68HC908JL3E Family Data Sheet, Rev. 4
SP HIGH
Figure
SP LOW
7-7.)
NOTE
RESULT
Security
79
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