C8051F321 Silicon Laboratories Inc, C8051F321 Datasheet - Page 108
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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C8051F320/1
11.1.3. FLASH Write Procedure
FLASH bytes are programmed by software with the following sequence:
Steps 3-8 must be repeated for each byte to be written. After FLASH writes are complete, PSWE should be cleared so
that MOVX instructions do not target program memory.
108
†
Note: 512 bytes at location 0x3E00 to 0x3FFF are reserved.
Erase Cycle Time
Write Cycle Time
PARAMETER
FLASH Size
Endurance
Step 1. Disable interrupts (recommended).
Step 2. Erase the 512-byte FLASH page containing the target location, as described in
Step 3. Write the first key code to FLKEY: 0xA5.
Step 4. Write the second key code to FLKEY: 0xF1.
Step 5. Set the PSWE bit (register PSCTL).
Step 6. Clear the PSEE bit (register PSCTL).
Step 7. Using the MOVX instruction, write a single data byte to the desired location within the 512-byte
Step 8. Clear the PSWE bit (register PSCTL).
sector.
Table 11.1. FLASH Electrical Characteristics
25 MHz System Clock
25 MHz System Clock
CONDITIONS
C8051F320/1
Rev. 1.1
16384
MIN
20k
10
40
†
TYP
100k
15
55
MAX
20
70
Section
Erase/Write
UNITS
11.1.2.
bytes
ms
µs
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