MC9S08AC16MFDE Freescale Semiconductor, MC9S08AC16MFDE Datasheet - Page 56
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MC9S08AC16MFDE
Manufacturer Part Number
MC9S08AC16MFDE
Description
IC MCU 8BIT 16K FLASH 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.MC9S08AC8CFGE.pdf
(336 pages)
Specifications of MC9S08AC16MFDE
Core Processor
HCS08
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
38
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-QFN
Processor Series
S08AC
Core
HCS08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
SCI/SPI
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
38
Number Of Timers
8
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
DEMO9S08AC60E, DEMOACEX, DEMOACKIT, DCF51AC256, DC9S08AC128, DC9S08AC16, DC9S08AC60, DEMO51AC256KIT
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
Package
48QFN EP
Family Name
HCS08
Maximum Speed
40 MHz
Operating Supply Voltage
3.3|5 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Chapter 4 Memory
disengages security and the other three combinations engage security. Notice the erased state (1:1) makes
the MCU secure. During development, whenever the FLASH is erased, it is good practice to immediately
program the SEC00 bit to 0 in NVOPT so SEC01:SEC00 = 1:0. This would allow the MCU to remain
unsecured after a subsequent reset.
The on-chip debug module cannot be enabled while the MCU is secure. The separate background debug
controller can still be used for background memory access commands, but the MCU cannot enter active
background mode except by holding BKGD/MS low at the rising edge of reset.
A user can choose to allow or disallow a security unlocking mechanism through an 8-byte backdoor
security key. If the nonvolatile KEYEN bit in NVOPT/FOPT is 0, the backdoor key is disabled and there
is no way to disengage security without completely erasing all FLASH locations. If KEYEN is 1, a secure
user program can temporarily disengage security by:
The security key can be written only from secure memory (either RAM or FLASH), so it cannot be entered
through background commands without the cooperation of a secure user program.
The backdoor comparison key (NVBACKKEY through NVBACKKEY+7) is located in FLASH memory
locations in the nonvolatile register space so users can program these locations exactly as they would
program any other FLASH memory location. The nonvolatile registers are in the same 512-byte block of
FLASH as the reset and interrupt vectors, so block protecting that space also block protects the backdoor
comparison key. Block protects cannot be changed from user application programs, so if the vector space
is block protected, the backdoor security key mechanism cannot permanently change the block protect,
security settings, or the backdoor key.
Security can always be disengaged through the background debug interface by taking these steps:
56
1. Writing 1 to KEYACC in the FCNFG register. This makes the FLASH module interpret writes to
2. Writing the user-entered key values to the NVBACKKEY through NVBACKKEY+7 locations.
3. Writing 0 to KEYACC in the FCNFG register. If the 8-byte key that was just written matches the
1. Disable any block protections by writing FPROT. FPROT can be written only with background
2. Mass erase FLASH if necessary.
3. Blank check FLASH. Provided FLASH is completely erased, security is disengaged until the next
the backdoor comparison key locations (NVBACKKEY through NVBACKKEY+7) as values to
be compared against the key rather than as the first step in a FLASH program or erase command.
These writes must be done in order starting with the value for NVBACKKEY and ending with
NVBACKKEY+7. STHX should not be used for these writes because these writes cannot be done
on adjacent bus cycles. User software normally would get the key codes from outside the MCU
system through a communication interface such as a serial I/O.
key stored in the FLASH locations, SEC01:SEC00 are automatically changed to 1:0 and security
will be disengaged until the next reset.
debug commands, not from application software.
reset.
To avoid returning to secure mode after the next reset, program NVOPT so SEC01:SEC00 = 1:0.
MC9S08AC16 Series Data Sheet, Rev. 8
Freescale Semiconductor
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