C8051F91X-C8051F90X 查看數據表（PDF） - Silicon Laboratories

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C8051F91X-C8051F90X

Single/Dual Battery, 0.9–3.6 V, 16–8 kB, SmaRTClock, 12/10-Bit ADC MCU

Silicon Laboratories 

C8051F91x-C8051F90x

SFR Definition 13.2. FLKEY: Flash Lock and Key

Bit

7

6

5

4

3

2

1

0

Name

FLKEY[7:0]

Type

R/W

Reset

0

0

0

0

0

0

0

0

SFR Page = 0x0; SFR Address = 0xB6

Bit Name

Function

7:0 FLKEY[7:0] Flash Lock and Key Register.

Write:

This register provides a lock and key function for Flash erasures and writes. Flash

writes and erases are enabled by writing 0xA5 followed by 0xF1 to the FLKEY regis-

ter. Flash writes and erases are automatically disabled after the next write or erase is

complete. If any writes to FLKEY are performed incorrectly, or if a Flash write or erase

operation is attempted while these operations are disabled, the Flash will be perma-

nently locked from writes or erasures until the next device reset. If an application

never writes to Flash, it can intentionally lock the Flash by writing a non-0xA5 value to

FLKEY from software.

Read:

When read, bits 1–0 indicate the current Flash lock state.

00: Flash is write/erase locked.

01: The first key code has been written (0xA5).

10: Flash is unlocked (writes/erases allowed).

11: Flash writes/erases disabled until the next reset.

Rev. 1.0

141

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