C8051F321R Silicon Laboratories Inc, C8051F321R Datasheet - Page 108

• Manufacturer Part Number: C8051F321R
• Description: IC 8051 MCU 16K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F32xr

Specifications of C8051F321R

• 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: -
• Other names: 336-1067-2

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