C8051F131R Silicon Labs, C8051F131R Datasheet - Page 207

• Manufacturer Part Number: C8051F131R
• Description: 8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
• Manufacturer: Silicon Labs

Specifications of C8051F131R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 100 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8.25 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: TQFP-64
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 9
• Data Rom Size: 64 KB
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V

15.2.1. Summary of Flash Security Options
There are three Flash access methods supported on the C8051F12x and C8051F13x devices; 1) Access-
ing Flash through the JTAG debug interface, 2) Accessing Flash from firmware residing below the Flash
Access Limit, and 3) Accessing Flash from firmware residing at or above the Flash Access Limit.
Accessing Flash through the JTAG debug interface:
Accessing Flash from firmware residing below the Flash Access Limit:
Accessing Flash from firmware residing at or above the Flash Access Limit:
1. The Read and Write/Erase Lock bytes (security bytes) provide security for Flash access
2. Any unlocked page may be read from, written to, or erased.
3. Locked pages cannot be read from, written to, or erased.
4. Reading the security bytes is always permitted.
5. Locking additional pages by writing to the security bytes is always permitted.
6. If the page containing the security bytes is unlocked , it can be directly erased. Doing so will
7. If the page containing the security bytes is locked , it cannot be directly erased. To unlock the
8. The Reserved Area cannot be read from, written to, or erased at any time.
1. The Read and Write/Erase Lock bytes (security bytes) do not restrict Flash access from user
2. Any page of Flash except the page containing the security bytes may be read from, written to,
3. The page containing the security bytes cannot be erased. Unlocking pages of Flash can
4. The page containing the security bytes may be read from or written to. Pages of Flash can be
5. The Reserved Area cannot be read from, written to, or erased at any time.
1. The Read and Write/Erase Lock bytes (security bytes) do not restrict Flash access from user
2. Any page of Flash at or above the Flash Access Limit except the page containing the security
3. Any page of Flash below the Flash Access Limit cannot be read from, written to, or erased.
4. Code branches to locations below the Flash Access Limit are permitted.
5. The page containing the security bytes cannot be erased. Unlocking pages of Flash can
6. The page containing the security bytes may be read from or written to. Pages of Flash can be
7. The Reserved Area cannot be read from, written to, or erased at any time.
through the JTAG interface.
reset the security bytes and unlock all pages of Flash.
page containing the security bytes, a full JTAG device erase is required. A full JTAG
device erase will erase all Flash pages, including the page containing the security bytes and
the security bytes themselves.
firmware.
or erased.
only be performed via the JTAG interface.
locked from JTAG access by writing to the security bytes.
firmware.
bytes may be read from, written to, or erased.
only be performed via the JTAG interface.
locked from JTAG access by writing to the security bytes.
Rev. 1.4
C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
207