C8051F93X-C8051F92X 데이터 시트보기 (PDF) - Silicon Laboratories

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C8051F93X-C8051F92X

Single/Dual Battery, 0.9–3.6 V, 64/32 kB, SmaRTClock, 10-Bit ADC MCU

Silicon Laboratories 

C8051F93x-C8051F92x

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 13.1 summarizes the Flash security

features of the C8051F93x-C8051F92x devices.

Table 13.1. Flash Security Summary

Action

C2 Debug User Firmware executing from:

Interface

an unlocked page a locked page

Read, Write or Erase unlocked pages

(except page with Lock Byte)

Permitted

Permitted

Permitted

Read, Write or Erase locked pages

(except page with Lock Byte)

Not Permitted

FEDR

Permitted

Read or Write page containing Lock Byte

(if no pages are locked)

Permitted

Permitted

Permitted

Read or Write page containing Lock Byte

(if any page is locked)

Not Permitted

FEDR

Permitted

Read contents of Lock Byte

(if no pages are locked)

Permitted

Permitted

Permitted

Read contents of Lock Byte

(if any page is locked)

Not Permitted

FEDR

Permitted

Erase page containing Lock Byte

(if no pages are locked)

Permitted

FEDR

FEDR

Erase page containing Lock Byte - Unlock all pages Only by C2DE

(if any page is locked)

FEDR

FEDR

Lock additional pages

(change 1s to 0s in the Lock Byte)

Not Permitted

FEDR

FEDR

Unlock individual pages

(change 0s to 1s in the Lock Byte)

Not Permitted

FEDR

FEDR

Read, Write or Erase Reserved Area

Not Permitted

FEDR

FEDR



C2DE—C2 Device Erase (Erases all Flash pages including the page containing the Lock Byte)

FEDR—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.

- The scratchpad is locked when all other Flash pages are locked.

- The scratchpad is erased when a Flash Device Erase command is performed.

Rev. 1.3

151

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