S9S12GN16F0VLF Freescale Semiconductor, S9S12GN16F0VLF Datasheet - Page 1185
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S9S12GN16F0VLF
Manufacturer Part Number
S9S12GN16F0VLF
Description
16-bit Microcontrollers - MCU 16-bit16k Flash 2k RAM
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12G96F0CLL.pdf
(1292 pages)
Specifications of S9S12GN16F0VLF
Rohs
yes
Core
S12
Processor Series
MC9S12G
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
16 KB
Data Ram Size
1024 B
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
TSSOP-20
Mounting Style
SMD/SMT
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31.5
The Flash module provides security information to the MCU. The Flash security state is defined by the
SEC bits of the FSEC register (see
register using data read from the security byte of the Flash configuration field at global address 0x3_FF0F.
The security state out of reset can be permanently changed by programming the security byte assuming
that the MCU is starting from a mode where the necessary P-Flash erase and program commands are
available and that the upper region of the P-Flash is unprotected. If the Flash security byte is successfully
programmed, its new value will take affect after the next MCU reset.
The following subsections describe these security-related subjects:
31.5.1
The MCU may be unsecured by using the backdoor key access feature which requires knowledge of the
contents of the backdoor keys (four 16-bit words programmed at addresses 0x3_FF00-0x3_FF07). If the
KEYEN[1:0] bits are in the enabled state (see
command (see
keys stored in the Flash memory via the Memory Controller. If the keys presented in the Verify Backdoor
Access Key command match the backdoor keys stored in the Flash memory, the SEC bits in the FSEC
register (see
not permitted as backdoor keys. While the Verify Backdoor Access Key command is active, P-Flash
memory and EEPROM memory will not be available for read access and will return invalid data.
The user code stored in the P-Flash memory must have a method of receiving the backdoor keys from an
external stimulus. This external stimulus would typically be through one of the on-chip serial ports.
If the KEYEN[1:0] bits are in the enabled state (see
backdoor key access sequence described below:
The Verify Backdoor Access Key command is monitored by the Memory Controller and an illegal key will
prohibit future use of the Verify Backdoor Access Key command. A reset of the MCU is the only method
to re-enable the Verify Backdoor Access Key command. The security as defined in the Flash security byte
(0x3_FF0F) is not changed by using the Verify Backdoor Access Key command sequence. The backdoor
keys stored in addresses 0x3_FF00-0x3_FF07 are unaffected by the Verify Backdoor Access Key
command sequence. The Verify Backdoor Access Key command sequence has no effect on the program
and erase protections defined in the Flash protection register, FPROT.
After the backdoor keys have been correctly matched, the MCU will be unsecured. After the MCU is
unsecured, the sector containing the Flash security byte can be erased and the Flash security byte can be
Freescale Semiconductor
•
•
•
1. Follow the command sequence for the Verify Backdoor Access Key command as explained in
2. If the Verify Backdoor Access Key command is successful, the MCU is unsecured and the
Unsecuring the MCU using Backdoor Key Access
Unsecuring the MCU in Special Single Chip Mode using BDM
Mode and Security Effects on Flash Command Availability
Section 31.4.6.11
SEC[1:0] bits in the FSEC register are forced to the unsecure state of 10
Security
Unsecuring the MCU using Backdoor Key Access
Table
Section
31-11) will be changed to unsecure the MCU. Key values of 0x0000 and 0xFFFF are
31.4.6.11) allows the user to present four prospective keys for comparison to the
MC9S12G Family Reference Manual, Rev.1.23
Table
31-11). During reset, the Flash module initializes the FSEC
Section
Section
31.3.2.2), the Verify Backdoor Access Key
31.3.2.2), the MCU can be unsecured by the
240 KByte Flash Module (S12FTMRG240K2V1)
1187
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