C8051F705-GM Silicon Laboratories Inc, C8051F705-GM Datasheet - Page 156

• Manufacturer Part Number: C8051F705-GM
• Description: IC 8051 MCU 15K FLASH 48-QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F70xr

Specifications of C8051F705-GM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Cap Sense, POR, PWM, WDT
• Number Of I /o: 39
• Program Memory Size: 15KB (15K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 32 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-QFN
• Processor Series: C8051F7x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 512 B
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 39
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F700DK
• Minimum Operating Temperature: - 40 C
• Height: 0.95 mm
• Length: 7 mm
• Supply Voltage (max): 1.9 V, 3.6 V
• Supply Voltage (min): 1.7 V, 1.8 V
• Width: 7 mm
• For Use With: 336-1635 - DEV KIT FOR C8051F700
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 336-1612-5

C8051F70x/71x
23.4. EEPROM Security
RAM can only be downloaded to EEPROM after firmware writes a sequence of two bytes to EEKEY. In
order to enable EEPROM writes:
1. Write the first EEPROM key code byte to EEKEY: 0x55
2. Write the second EEPROM key code byte to EEKEY: 0xAA
After a EEPROM writes have been enabled and a single write has executed, the control logic locks
EEPROM writes until the two-byte unlock sequence has been entered into EEKEY again.
The protection state of the EEPROM can be observed by reading EEPSTATE (EEKEY2:0). This state can
be read at any time without affecting the EEPROM’s protection state.
If the two-byte unlock sequence is entered incorrectly, or if a write is attempted without first entering the
two-byte sequence, EEPROM writes will be locked until the next power-on reset.
SFR Definition 23.1. EEADDR: EEPROM Byte Address
SFR Address = 0xB6; SFR Page = All Pages
156
Name
Reset
7:5
4:0
Bit
Type
Bit
EEADDR[4:0]
Unused
Name
R
7
0
Read = 000b; Write = Don’t Care
EEPROM Byte Address
Selects one of 32 EEPROM bytes to read/write.
R
6
0
R
5
0
Rev. 1.0
4
0
Description
3
0
EEADDR[4:0]
R/W
2
0
1
0
0
0