Datasheet
© 2008 Microchip Technology Inc. DS80280G-page 15
PIC24HJXXXGPX06/X08/X10
42. Module: FRC Oscillator
For certain values of the TUN<5:0> bits
(OSCTUN<5:0>), the resultant frequencies do not
match the expected values.
As shown in Table 4, the actual frequencies
obtained for different values of the TUN<5:0> bits
are listed in terms of percentage change relative to
the center frequency of 7.3728 MHz. The
frequency errors listed in the table are
approximate and may vary slightly from device to
device.
It is recommended that the user application
include some means of measuring the exact
oscillator frequency in order to verify the
frequencies listed below.
Work around
Configure your peripherals and other system
parameters based on the actual frequencies listed
in Table 4.
TABLE 4:
TUN<5:0>
Expected
Change from
7.3728 MHz
Actual
Change from
7.3728 MHz
000000 ——
000001 +0.375% +0.375%
000010 +0.75% +0.75%
000011 +1.125% +1.125%
000100 +1.5% +1.5%
000101 +1.875% +1.875%
000110 +2.25% +2.25%
000111 +2.625% +2.625%
001000 +3% +3%
001001 +3.375% +3.375%
001010 +3.75% +3.75%
001011 +4.125% +4.125%
001100 +4.5% +4.5%
001101 +4.875% +4.875%
001110 +5.25% +5.25%
001111 +5.625% +5.625%
010000 +6% +8.325%
010001 +6.375% +8.7%
010010 +6.75% +9.075%
010011 +7.125% +9.45%
010100 +7.5% +9.825%
010101 +7.875% +10.2%
010110 +8.25% +10.575%
010111 +8.625% +10.95%
011000 +9% +11.325%
011001 +9.375% +11.7%
011010 +9.75% +12.075%
011011 +10.125% +12.45%
011100 +10.5% +12.825%
011101 +10.875% +13.2%
011110 +11.25% +13.575%
011111 +11.625% +13.95%
100000 -12% -12%
100001 -11.625% -11.625%
100010 -11.25% -11.25%
100011 -10.875% -10.875%
100100 -10.5% -10.5%
100101 -10.125% -10.125%
100110 -9.75% -9.75%
100111 -9.375% -9.375%
101000 -9% -9%
101001 -8.625% -8.625%
101010 -8.25% -8.25%
101011 -7.875% -7.875%
101100 -7.5% -7.5%
101101 -7.125% -7.125%
101110 -6.75% -6.75%
101111 -6.375% -6.375%
110000 -6% -3.675%
110001 -5.625% -3.3%
110010 -5.25% -2.925%
110011 -4.875% -2.55%
110100 -4.5% -2.175%
110101 -4.125% -1.8%
110110 -3.75% -1.425%
110111 -3.375% -1.05%
111000 -3% -0.675%
111001 -2.625% -0.3%
111010 -2.25% +0.075%
111011 -1.875% +0.45%
111100 -1.5% +0.825%
111101 -1.125% +1.2%
111110 -0.75% +1.575%
111111 -0.375% +1.95%
TABLE 4: (CONTINUED)
TUN<5:0>
Expected
Change from
7.3728 MHz
Actual
Change from
7.3728 MHz