C8051F045 查看數據表（PDF） - Silicon Laboratories
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C8051F045 Datasheet PDF : 328 Pages
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C8051F040/1/2/3/4/5/6/7
SFR Definition 23.3. CKCON: Clock Control
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset Value
-
-
-
T1M
T0M
-
SCA1
SCA0 00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
SFR Address: 0x8E
SFR Page: 0
Bits7-5:
Bit4:
Bit3:
Bit2:
Bits1-0:
UNUSED. Read = 000b, Write = don’t care.
T1M: Timer 1 Clock Select.
This select the clock source supplied to Timer 1. T1M is ignored when C/T1 is set to logic 1.
0: Timer 1 uses the clock defined by the prescale bits, SCA1-SCA0.
1: Timer 1 uses the system clock.
T0M: Timer 0 Clock Select.
This bit selects the clock source supplied to Timer 0. T0M is ignored when C/T0 is set to
logic 1.
0: Counter/Timer 0 uses the clock defined by the prescale bits, SCA1-SCA0.
1: Counter/Timer 0 uses the system clock.
UNUSED. Read = 0b, Write = don’t care.
SCA1-SCA0: Timer 0/1 Prescale Bits
These bits control the division of the clock supplied to Timer 0 and/or Timer 1 if configured
to use prescaled clock inputs.
SCA1
0
0
1
1
SCA0
0
1
0
1
Prescaled Clock
System clock divided by 12
System clock divided by 4
System clock divided by 48
External clock divided by 8
SFR Definition 23.4. TL0: Timer 0 Low Byte
R/W
R/W
R/W
R/W
R/W
R/W
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bits 7-0: TL0: Timer 0 Low Byte.
The TL0 register is the low byte of the 16-bit Timer 0.
R/W
R/W
Reset Value
00000000
Bit1
Bit0
SFR Address: 0x8A
SFR Page: 0
Rev. 1.5
293
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