C8051F964-A-GQ Silicon Labs, C8051F964-A-GQ Datasheet - Page 245

• Manufacturer Part Number: C8051F964-A-GQ
• Description: 8-bit Microcontrollers - MCU 64KB DC-DC LCD AES
• Manufacturer: Silicon Labs

Specifications of C8051F964-A-GQ

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 24.5 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 8 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 1.8 V to 3.8 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: QFP-80
• Mounting Style: SMD/SMT

Steps 4–7 must be repeated for each 1024-byte page to be erased.
Notes:
18.1.3. Flash Write Procedure
A write to flash memory can clear bits to logic 0 but cannot set them; only an erase operation can set bits
to logic 1 in flash. A byte location to be programmed should be erased before a new value is written.
The recommended procedure for writing a single byte in flash is as follows:
Steps 2–8 must be repeated for each byte to be written.
Notes:
9. Restore previous interrupt state.
1. Flash security settings may prevent erasure of some flash pages, such as the reserved area and the page
2. 8-bit MOVX instructions cannot be used to erase or write to flash memory at addresses higher than 0x00FF.
1. Save current interrupt state and disable interrupts.
2. Set the PSWE bit (register PSCTL).
3. Clear the PSEE bit (register PSCTL).
4. If writing to an address in Banks 1, 2, or 3, set the COBANK[1:0] bits (register PSBANK) for the
5. Ensure that the flash byte has been erased (has a value of 0xFF).
6. Write the first key code to FLKEY: 0xA5.
7. Write the second key code to FLKEY: 0xF1.
8. Using the MOVX instruction, write a single data byte to the desired location within the 1024-byte
9. Clear the PSWE bit.
10. Restore previous interrupt state.
1. Flash security settings may prevent writes to some areas of flash, such as the reserved area. For a summary of
2. 8-bit MOVX instructions cannot be used to erase or write to flash memory at addresses higher than 0x00FF.
appropriate bank.
sector.
containing the lock bytes. For a summary of flash security settings and restrictions affecting flash erase
operations, please see Section “18.3. Security Options” on page 247.
flash security settings and restrictions affecting flash write operations, please see Section “18.3. Security
Options” on page 247.
Rev. 0.5
C8051F96x
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