C8051F020 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F020

8K ISP FLASH MCU Family

Silicon Laboratories 

C8051F020/1/2/3

Important Note About the PCA0CN Register: If the main PCA counter (PCA0H : PCA0L) overflows during the

execution phase of a read-modify-write instruction (bit-wise SETB or CLR, ANL, ORL, XRL) that targets the

PCA0CN register, the CF (Counter Overflow) bit will not be set. The following steps should be taken when perform-

ing a bit-wise operation on the PCA0CN register:

Step 1. Disable global interrupts (EA = 0).

Step 2. Read PCA0L. This will latch the value of PCA0H.

Step 3. Read PCA0H, saving the value.

Step 4. Execute the bit-wise operation on CCFn (for example, CLR CCF0, or CCF0 = 0;).

Step 5. Read PCA0L.

Step 6. Read PCA0H, saving the value.

Step 7. If the value of PCA0H read in Step 3 is 0xFF and the value for PCA0H read in Step 6 is 0x00, then

manually set the CF bit in software (for example, SETB CF, or CF = 1;).

Step 8. Re-enable interrupts (EA = 1).

Rev. 1.4

251

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