C8051F350 Silicon Laboratories Inc, C8051F350 Datasheet - Page 121

IC 8051 MCU 8K FLASH 32LQFP

C8051F350

Manufacturer Part Number
C8051F350
Description
IC 8051 MCU 8K FLASH 32LQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F35xr
Datasheets

Specifications of C8051F350

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 8x24b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-LQFP
Data Bus Width
8 bit
Data Rom Size
128 B
On-chip Adc
10 bit
Number Of Timers
16 bit
Operating Supply Voltage
2.7 V to 3.6 V
Mounting Style
SMD/SMT
Height
1.4 mm
Length
7 mm
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Width
7 mm
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Lead Free Status / Rohs Status
No RoHS Version Available

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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

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