mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 177
mc68hc908lj24
Manufacturer Part Number
mc68hc908lj24
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908LJ24.pdf
(464 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68HC908LJ24
Manufacturer:
FREESCALE
Quantity:
3
Company:
Part Number:
mc68hc908lj24CFQ
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
mc68hc908lj24CFU
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
mc68hc908lj24CFU
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
Company:
Part Number:
mc68hc908lj24CPB
Manufacturer:
FREESCALE
Quantity:
1 831
Company:
Part Number:
mc68hc908lj24CPB
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
mc68hc908lj24CPK
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
mc68hc908lj24CPK
Manufacturer:
FRE/MOT
Quantity:
20 000
- Current page: 177 of 464
- Download datasheet (5Mb)
10.5 Security
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
NOTE:
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.
Do not leave locations $FFF6–$FFFD blank. For security reasons,
program locations $FFF6–$FFFD even if they are not used for vectors.
During monitor mode entry, the MCU waits after the power-on reset for
the host to send the eight security bytes on pin PTA0. 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
PTA0
RST
V
NOTES:
DD
1 = Echo delay, 2 bit times.
2 = Data return delay, 2 bit times.
4 = Wait 1 bit time before sending next byte.
FROM HOST
Figure 10-8. Monitor Mode Entry Timing
FROM MCU
Monitor ROM (MON)
4096 + 32 ICLK CYCLES
1
256 BUS CYCLES (MINIMUM)
4
1
Figure
10-8.)
1
Monitor ROM (MON)
2
4
Data Sheet
Security
1
177
Related parts for mc68hc908lj24
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet: