C8051F121 Silicon Laboratories Inc, C8051F121 Datasheet - Page 327

• Manufacturer Part Number: C8051F121
• Description: IC 8051 MCU FLASH 128K 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F12xr

Specifications of C8051F121

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 100MHz
• Connectivity: EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 32
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8.25K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x8b, 8x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Important Note About the PCA0CN Register: If the main PCA counter (PCA0H : PCA0L) overflows dur-
ing 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. If the CF flag is used by soft-
ware to keep track of counter overflows, the following steps should be taken when performing a bit-wise
operation on the PCA0CN register:
Step 1. Disable global interrupts.
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
Step 8. Re-enable interrupts.
0x00, then manually set the CF bit in software (for example, SETB CF, or CF = 1;).
Rev. 1.4
C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
327