C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 111

• Manufacturer Part Number: C8051F321
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 13x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Bits7-0:
Bits7:
Bits6-0:
FOSE
R/W
R/W
Bit7
Bit7
FLKEY: FLASH Lock and Key Register
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 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 frequencies below
10 MHz, disabling the FLASH one-shot will increase system power consumption.
0: FLASH one-shot disabled.
1: FLASH one-shot enabled.
RESERVED. Read = 0. Must Write 0.
Reserved
R/W
R/W
Bit6
Bit6
Figure 11.3. FLKEY: FLASH Lock and Key Register
Reserved
Figure 11.4. FLSCL: FLASH Scale Register
R/W
R/W
Bit5
Bit5
Reserved
R/W
R/W
Bit4
Bit4
Reserved
R/W
R/W
Bit3
Bit3
Rev. 1.1
Reserved
R/W
R/W
Bit2
Bit2
Reserved
R/W
R/W
Bit1
Bit1
C8051F320/1
Reserved
R/W
R/W
Bit0
Bit0
SFR Address:
SFR Address:
00000000
10000000
Reset Value
Reset Value
0xB7
0xB6
111