C8051F330DR Silicon Labs, C8051F330DR Datasheet - Page 106

• Manufacturer Part Number: C8051F330DR
• Description: 8-bit Microcontrollers - MCU 8kB 10ADC
• Manufacturer: Silicon Labs

Specifications of C8051F330DR

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 8 KB
• Data Ram Size: 768 B
• On-chip Adc: No
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: QFN-20
• Mounting Style: SMD/SMT
• Data Rom Size: 128 B
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• On-chip Dac: No
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 1500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

Bits7–0: FLKEY: Flash Lock and Key Register
Bit7:
Bits6–0: RESERVED. Read = 0. Must Write 0.
FOSE
R/W
R/W
Bit7
Bit7
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 register. 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 permanently locked from writes or era-
sures 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.
FOSE: Flash One-shot Enable
This bit enables the Flash read one-shot. When the Flash one-shot disabled, the Flash
sense amps are enabled for a full clock cycle during Flash reads. At system clock frequen-
cies below 10 MHz, disabling the Flash one-shot will increase system power consumption.
0: Flash one-shot disabled.
1: Flash one-shot enabled.
Reserved Reserved Reserved Reserved Reserved Reserved Reserved 10000000
R/W
R/W
Bit6
Bit6
SFR Definition 11.2. FLKEY: Flash Lock and Key
SFR Definition 11.3. FLSCL: Flash Scale
R/W
R/W
Bit5
Bit5
R/W
R/W
Bit4
Bit4
Rev. 1.7
R/W
R/W
Bit3
Bit3
R/W
R/W
Bit2
Bit2
C8051F330/1/2/3/4/5
R/W
R/W
Bit1
Bit1
SFR Address:
SFR Address:
R/W
R/W
Bit0
Bit0
0xB6
0xB7
00000000
Reset Value
Reset Value
109