C8051F317-GMR Silicon Laboratories Inc, C8051F317-GMR Datasheet - Page 222
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C8051F317-GMR
Manufacturer Part Number
C8051F317-GMR
Description
MCU 8-Bit C8051F31x 8051 CISC 16KB Flash 3.3V 24-Pin QFN EP T/R
Manufacturer
Silicon Laboratories Inc
Datasheet
1.C8051F310-TB.pdf
(228 pages)
Specifications of C8051F317-GMR
Package
24QFN EP
Device Core
8051
Family Name
C8051F31x
Maximum Speed
25 MHz
Ram Size
1.25 KB
Program Memory Size
16 KB
Operating Supply Voltage
3.3 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
21
Interface Type
I2C/SMBus/SPI/UART
On-chip Adc
17-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
4
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
C8051F317-GMR
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
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C8051F310/1/2/3/4/5/6/7
19.3. PCA Counter
On “REV A” devices, 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. An example software work-around is as follows:
This behavior is not present on “REV B” and later devices. Software written for “REV A” devices will run on
“REV B” and later devices without modification.
222
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
Step 8. Re-enable interrupts (EA = 1).
0x00, then manually set the CF bit in software (for example, SETB CF, or CF = 1;).
Rev. 1.7
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