C8051F336DK Silicon Laboratories Inc, C8051F336DK Datasheet - Page 93

• Manufacturer Part Number: C8051F336DK
• Description: DEV KIT FOR C8051F336
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F336DK

• Contents: Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
• Processor To Be Evaluated: C8051F33x
• Interface Type: USB, UART
• Operating Supply Voltage: 7 V to 15 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051F336
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1430

Security Lock Byte is unlocked when no other Flash pages are locked (all bits of the Lock Byte are
‘1’) and locked when any other Flash pages are locked (any bit of the Lock Byte is ‘0’). An example
is shown in Figure 16.1.
16.3. Security Options
The CIP-51 provides security options to protect the Flash memory from inadvertent modification by soft-
ware as well as to prevent the viewing of proprietary program code and constants. The Program Store
Write Enable (bit PSWE in register PSCTL) and the Program Store Erase Enable (bit PSEE in register
PSCTL) bits protect the Flash memory from accidental modification by software. PSWE must be explicitly
set to ‘1’ before software can modify the Flash memory; both PSWE and PSEE must be set to ‘1’ before
software can erase Flash memory. Additional security features prevent proprietary program code and data
constants from being read or altered across the C2 interface.
A Security Lock Byte located in Flash user space offers protection of the Flash program memory from
access (reads, writes, or erases) by unprotected code or the C2 interface. See
Organization” on page 74
user to lock n 512-byte Flash pages, starting at page 0 (addresses 0x0000 to 0x01FF), where n is the 1’s
complement number represented by the Security Lock Byte. Note that the page containing the Flash
Flash pages locked:
Security Lock Byte:
1s Complement:
for the location of the security byte. The Flash security mechanism allows the
Figure 16.1. Security Byte Decoding
3 (First two Flash pages + Lock Byte Page)
Rev.1.0
00000010b
11111101b
C8051F336/7/8/9
Section “13. Memory
93