C8051F352 Silicon Laboratories Inc, C8051F352 Datasheet - Page 121

• Manufacturer Part Number: C8051F352
• Description: IC 8051 MCU 8K FLASH 32LQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F35xr

Specifications of C8051F352

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, Temp Sensor, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x16b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Processor Series: C8051F35x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: I2C, SPI, UART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 16 bit
• On-chip Dac: 8 bit
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: No

Bits7-0:
Bits7-5:
Bit 4:
Bits3-0:
Reserved Reserved Reserved
R/W
R/W
Bit7
Bit7
FLKEY: 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 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.
RESERVED. Read = 000b. Must Write 000b.
FLRT: Flash Read Time.
This bit should be programmed to the smallest allowed value, according to the system clock
speed.
0: SYSCLK <= 25 MHz.
1: SYSCLK <= 50 MHz.
RESERVED. Read = 0000b. Must Write 0000b.
R/W
R/W
Bit6
Bit6
Figure 15.3. FLKEY: Flash Lock and Key Register
Figure 15.4. FLSCL: Flash Scale Register
R/W
R/W
Bit5
Bit5
FLRT
R/W
R/W
Bit4
Bit4
Reserved Reserved Reserved Reserved 00000000
Rev. 0.4
R/W
R/W
Bit3
Bit3
R/W
R/W
Bit2
Bit2
C8051F350/1/2/3
R/W
R/W
Bit1
Bit1
SFR Address:
SFR Address:
R/W
R/W
Bit0
Bit0
0xB7
0xB6
00000000
Reset Value
Reset Value
121