MC9S08JM16CGT Freescale Semiconductor, MC9S08JM16CGT Datasheet - Page 54
![MCU 8BIT 16K FLASH 48-QFN](/photos/37/62/376240/qfn-48_sml.jpg)
MC9S08JM16CGT
Manufacturer Part Number
MC9S08JM16CGT
Description
MCU 8BIT 16K FLASH 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.DEMO9S08JM16.pdf
(386 pages)
Specifications of MC9S08JM16CGT
Core Processor
HCS08
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, LIN, SCI, SPI, USB
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
37
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 8x12b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
48-QFN Exposed Pad
Processor Series
S08JM
Core
HCS08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
I2C, SPI
Maximum Clock Frequency
48 MHz
Number Of Programmable I/os
37
Number Of Timers
2
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
DEMOJM, DEMOJMSKT, DEMOFLEXISJMSD, DEMO9S08JM16
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit, 8 Channel
Controller Family/series
HCS08
No. Of I/o's
37
Ram Memory Size
1KB
Cpu Speed
48MHz
No. Of Timers
2
Digital Ic Case Style
QFN
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC9S08JM16CGT
Manufacturer:
PIXART
Quantity:
1 001
Part Number:
MC9S08JM16CGT
Manufacturer:
FREESCALE
Quantity:
20 000
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Chapter 4 Memory
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 (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:
4.7
The flash module has nine 8-bit registers in the high-page register space, three locations in the nonvolatile
register space in flash memory which are copied into three corresponding high-page control registers at
reset. There is also an 8-byte comparison key in flash memory. Refer to
absolute address assignments for all flash registers. This section refers to registers and control bits only by
their names. A Freescale-provided equate or header file normally is used to translate these names into the
appropriate absolute addresses.
54
1. Writing 1 to KEYACC in the FCNFG register. This makes the flash module interpret writes to the
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 reset.
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 must 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.
To avoid returning to secure mode after the next reset, program NVOPT so SEC01:SEC00 = 1:0.
Flash Registers and Control Bits
MC9S08JM16 Series Data Sheet, Rev. 2
Table 4-3
and
Freescale Semiconductor
Table 4-4
for the
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