Microchip Technology AC244045 데이터 시트
PIC16(L)F1825/1829
DS41440C-page 74
2010-2012 Microchip Technology Inc.
6.5
Reference Clock Control Register
REGISTER 6-1:
CLKRCON: REFERENCE CLOCK CONTROL REGISTER
R/W-0/0
R/W-0/0
R/W-1/1
R/W-1/1
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
CLKREN
CLKROE
CLKRSLR
CLKRDC<1:0>
CLKRDIV<2:0>
bit 7
bit 0
Legend:
R = Readable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
x = Bit is unknown
-n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 7
CLKREN: Reference Clock Module Enable bit
1 = Reference Clock module is enabled
0 = Reference Clock module is disabled
1 = Reference Clock module is enabled
0 = Reference Clock module is disabled
bit 6
CLKROE: Reference Clock Output Enable bit
(3)
1 = Reference Clock output is enabled on CLKR pin
0 = Reference Clock output disabled on CLKR pin
0 = Reference Clock output disabled on CLKR pin
bit 5
CLKRSLR: Reference Clock Slew Rate Control Limiting Enable bit
1 = Slew Rate limiting is enabled
0 = Slew Rate limiting is disabled
1 = Slew Rate limiting is enabled
0 = Slew Rate limiting is disabled
bit 4-3
CLKRDC<1:0>: Reference Clock Duty Cycle bits
11 = Clock outputs duty cycle of 75%
10 = Clock outputs duty cycle of 50%
01 = Clock outputs duty cycle of 25%
00 = Clock outputs duty cycle of 0%
11 = Clock outputs duty cycle of 75%
10 = Clock outputs duty cycle of 50%
01 = Clock outputs duty cycle of 25%
00 = Clock outputs duty cycle of 0%
bit 2-0
CLKRDIV<2:0> Reference Clock Divider bits
111 = Base clock value divided by 128
110 = Base clock value divided by 64
101 = Base clock value divided by 32
100 = Base clock value divided by 16
011 = Base clock value divided by 8
010 = Base clock value divided by 4
001 = Base clock value divided by 2
111 = Base clock value divided by 128
110 = Base clock value divided by 64
101 = Base clock value divided by 32
100 = Base clock value divided by 16
011 = Base clock value divided by 8
010 = Base clock value divided by 4
001 = Base clock value divided by 2
(1)
000 = Base clock value
(2)
Note 1: In this mode, the 25% and 75% duty cycle accuracy will be dependent on the source clock duty cycle.
2: In this mode, the duty cycle will always be equal to the source clock duty cycle, unless a duty cycle of 0%
is selected.
3: To route CLKR to pin, CLKOUTEN of Configuration Word 1 = 1 is required. CLKOUTEN of Configuration
Word 1 = 0 will result in F
OSC
/4. See
for details.