C8051F523A-IM Silicon Laboratories Inc, C8051F523A-IM Datasheet - Page 117

• Manufacturer Part Number: C8051F523A-IM
• Description: IC 8051 MCU 4K FLASH 10DFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F52xr

Specifications of C8051F523A-IM

• Program Memory Type: FLASH
• Program Memory Size: 4KB (4K x 8)
• Package / Case: 10-DFN
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 6
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.25 V
• Data Converters: A/D 6x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Processor Series: C8051F5x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI/UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 3
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F500DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 6-ch x 12-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1488 - KIT DEV C8051F53XA, C8051F52XA770-1006 - ISP 4PORT FOR SILABS C8051F MCU336-1455 - ADAPTER PROGRAM TOOLSTICK F520
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1491-5

The level of Flash security depends on the Flash access method. The three Flash access methods that
can be restricted are reads, writes, and erases from the C2 debug interface, user firmware executing on
unlocked pages, and user firmware executing on locked pages. Table 12.1 summarizes the Flash security
features of the ’F52x/’F52xA/’F53x/’F53xA devices.
Read, Write or Erase unlocked pages
(except page with Lock Byte)
Read, Write or Erase locked pages
(except page with Lock Byte)
Read or Write page containing Lock Byte
(if no pages are locked)
Read or Write page containing Lock Byte
(if any page is locked)
Read contents of Lock Byte
(if no pages are locked)
Read contents of Lock Byte
(if any page is locked)
Erase page containing Lock Byte
(if no pages are locked)
Erase page containing Lock Byte—Unlock all
pages (if any page is locked)
Lock additional pages
(change 1s to 0s in the Lock Byte)
Unlock individual pages
(change 0s to 1s in the Lock Byte)
Read, Write or Erase Reserved Area

C2 Device Eras—Erases all Flash pages including the page containing the Lock Byte.
Flash Error Reset—Not permitted; Causes Flash Error Device Reset (FERROR bit in RSTSRC is 1 after
reset).
- All prohibited operations that are performed via the C2 interface are ignored (do not cause device reset).
- Locking any Flash page also locks the page containing the Lock Byte.
- Once written to, the Lock Byte cannot be modified except by performing a C2 Device Erase.
- If user code writes to the Lock Byte, the Lock does not take effect until the next device reset.
Action
Table 12.1. Flash Security Summary
C8051F52x/F52xA/F53x/F53xA
Rev. 1.3
Not Permitted
Not Permitted
Not Permitted
Not Permitted
Not Permitted
Not Permitted
Erase Only
C2 Debug
C2 Device
Permitted
Permitted
Permitted
Permitted
Interface
an unlocked page
Flash Error Reset
Flash Error Reset
Flash Error Reset
Flash Error Reset Flash Error Reset
Flash Error Reset Flash Error Reset
Flash Error Reset Flash Error Reset
Flash Error Reset Flash Error Reset
Flash Error Reset Flash Error Reset
User Firmware executing from:
Permitted
Permitted
Permitted
a locked page
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
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