C8051F964-A-GQ Silicon Labs, C8051F964-A-GQ Datasheet - Page 254

• Manufacturer Part Number: C8051F964-A-GQ
• Description: 8-bit Microcontrollers - MCU 64KB DC-DC LCD AES
• Manufacturer: Silicon Labs

Specifications of C8051F964-A-GQ

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 24.5 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 8 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.8 V to 3.8 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFP-80
• Mounting Style: SMD/SMT

C8051F96x
SFR Definition 18.4. FLKEY: Flash Lock and Key
SFR Page = All Pages; SFR Address = 0xB7
254
Name
Reset
7:0 FLKEY[7:0] Flash Lock and Key Register.
Bit
Type
Bit
Name
7
0
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.
6
0
5
0
Rev. 0.5
4
0
FLKEY[7:0]
R/W
Function
3
0
2
0
1
0
0
0