C8051F303-GSR Silicon Labs, C8051F303-GSR Datasheet - Page 93

• Manufacturer Part Number: C8051F303-GSR
• Description: 8-bit Microcontrollers - MCU 8KB 14Pin MCU
• Manufacturer: Silicon Labs

Specifications of C8051F303-GSR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

Bits7–0: FLKEY: Flash Lock and Key Register
Bits7:
Bits6–0: RESERVED. Read = 0. Must Write 0.
FOSE
R/W
R/W
Bit7
Bit7
Write:
This register must be written to before Flash writes or erases can be performed. Flash
remains locked until this register is written to with the following key codes: 0xA5, 0xF1. The
timing of the writes does not matter, as long as the codes are written in order. The key codes
must be written for each Flash write or erase operation. Flash will be locked until the next
system reset if the wrong codes are written or if a Flash operation is attempted before the
codes have been written correctly.
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.
FOSE: Flash One-shot Enable
This bit enables the 50 ns Flash read one-shot. When the Flash one-shot disabled, the
Flash sense amps are enabled for a full clock cycle during Flash reads.
0: Flash one-shot disabled.
1: Flash one-shot enabled.
Reserved Reserved Reserved Reserved Reserved Reserved Reserved 10000000
R/W
Bit6
R/W
Bit6
SFR Definition 10.2.
SFR Definition 10.3.
R/W
Bit5
R/W
Bit5
R/W
Bit4
R/W
Bit4
FLKEY: Flash Lock and Key
Rev. 2.9
R/W
Bit3
R/W
Bit3
FLSCL: Flash Scale
R/W
Bit2
R/W
Bit2
C8051F300/1/2/3/4/5
R/W
Bit1
R/W
Bit1
R/W
Bit0
R/W
Bit0
SFR Address:
Reset Value
SFR Address:
00000000
Reset Value
0xB6
0xB7
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