C8051F330DR Silicon Labs, C8051F330DR Datasheet - Page 102

• Manufacturer Part Number: C8051F330DR
• Description: 8-bit Microcontrollers - MCU 8kB 10ADC
• Manufacturer: Silicon Labs

Specifications of C8051F330DR

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 8 KB
• Data Ram Size: 768 B
• On-chip Adc: No
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: QFN-20
• Mounting Style: SMD/SMT
• Data Rom Size: 128 B
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• On-chip Dac: No
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 1500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

11.3. 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 at the last byte of Flash user space offers protection of the Flash program
memory from access (reads, writes, or erases) by unprotected code or the C2 interface. The Flash security
mechanism allows the 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 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’). See example below.
any other FLASH
pages are locked
according to the
Access limit set
FLASH security
Locked when
Flash pages locked:
Security Lock Byte:
lock byte
Addresses locked:
1s Complement:
Unlocked FLASH Pages
Locked Flash Pages
C8051F330/1
Lock Byte
Reserved
0x0000 to 0x03FF (first two Flash pages) and 0x1C00 to 0x1DFF or 0x0E00 to
Figure 11.2. Flash Program Memory Map
0x1E00
0x1DFF
0x1DFE
0x1C00
0x0000
0x0FFF or 0x0600 to 0x07FF (Lock Byte Page)
3 (First two Flash pages + Lock Byte Page)
Unlocked FLASH Pages
Locked Flash Pages
Rev. 1.7
C8051F332/3
Lock Byte
Reserved
00000010b
11111101b
C8051F330/1/2/3/4/5
0x1000
0x0FFF
0x0FFE
0x0E00
0x0000
Unlocked FLASH Pages
Locked Flash Pages
C8051F334/5
Lock Byte
Reserved
0x800
0x07FF
0x07FE
0x0600
0x0000
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