C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 111
C8051F321
Manufacturer Part Number
C8051F321
Description
IC 8051 MCU 16K FLASH 28MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F32xr
Datasheet
1.C8051F320R.pdf
(256 pages)
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
-
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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
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