C8051F320 Silicon Laboratories Inc, C8051F320 Datasheet - Page 109

• Manufacturer Part Number: C8051F320
• Description: IC 8051 MCU 16K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F320

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 25
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 17x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

11.2.
The FLASH memory can be used for non-volatile data storage as well as program code. This allows data such as cal-
ibration coefficients to be calculated and stored at run time. Data is written using the MOVX write instruction and
read using the MOVC instruction. Note: MOVX read instructions always target XRAM.
11.3.
The CIP-51 provides security options to protect the FLASH memory from inadvertent modification by software 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 inter-
face.
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
compliment number represented by the Security Lock Byte. See example below.
Important Notes About the FLASH Security:
Security Lock Byte:
1’s Compliment:
FLASH pages locked:
Addresses locked:
Non-volatile Data Storage
Security Options
1.
tion to the selected pages).
2.
3.
space.
4.
unlocked page excluding the reserved area.
5.
excluding the reserved area and the page containing the Lock Byte.
6.
7.
Error system reset will be generated.
Clearing any bit of the Lock Byte to ‘0’ will lock the FLASH page containing the Lock Byte (in addi-
Locked pages cannot be read, written, or erased via the C2 interface.
Locked pages cannot be read, written, or erased by user firmware executing from unlocked memory
User firmware executing in a locked page may read and write FLASH memory in any locked or
User firmware executing in a locked page may erase FLASH memory in any locked or unlocked page
Locked pages can only be unlocked through the C2 interface with a C2 Device Erase command.
If a user firmware FLASH access attempt is denied (per restrictions #3, #4, and #5 above), a FLASH
00000010b
2
0x0000 to 0x03FF
11111101b
Rev. 1.1
C8051F320/1
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