C8051F961-A-GM Silicon Labs, C8051F961-A-GM Datasheet - Page 248

• Manufacturer Part Number: C8051F961-A-GM
• Description: 8-bit Microcontrollers - MCU 128KB, DC-DC, LCD AES, QFN40
• Manufacturer: Silicon Labs

Specifications of C8051F961-A-GM

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8448 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.5 V to 3.3 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFN-40
• Mounting Style: SMD/SMT
• Number Of Programmable I/os: 34
• Number Of Timers: 4

C8051F96x
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 18.1 summarizes the flash security
features of the C8051F96x devices.
248
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 Erase—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 18.1. Flash Security Summary
Rev. 0.5
C2 Device Erase
Not Permitted
Not Permitted
Not Permitted
Not Permitted
Not Permitted
Not Permitted
C2 Debug
Permitted
Permitted
Permitted
Permitted
Interface
Only
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