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参数资料
| 型号： | MCP25025-I/P |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDIP14 |
| 封装： | 0.300 INCH, PLASTIC, DIP-14 |
| 文件页数： | 32/64页 |
| 文件大小： | 1232K |
| 代理商： | MCP25025-I/P |
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MCP2502X/5X
DS21664C-page 38
2003 Microchip Technology Inc.
6.3.2
PWM DUTY CYCLE
The PWM duty cycle is specified by writing to the
PWMnDCH and TnCON registers. Up to 10-bit
resolution is available. The PWMnDCH contains the
eight MSb’s, while the TnCON register contains the two
LSb’s.
This
10-bit
value
is
represented
by
PWM1DCH:T1CON<1:0> for PWM Module 1 and
PWM2DCH:T2CON<1:0> for PWM Module 2.
The following equation is used to calculate the PMW
duty cycle:
PWMnDCH can be written to at any time, but the duty
cycle value is not latched into PWMnDBH until after a
match between PRn and TMRn occurs (i.e., the period
is complete).
The PWMnDBH register and 2-bit internal latch are
used to double-buffer the PWM duty cycle. This
double-buffering is essential for glitchless PWM
operation.
When the PWMnDBH and 2-bit latch match TMRn
concatenated with an internal 2-bit Q clock or 2 bits of
the TMRn prescaler, the PWM output pin is cleared.
Maximum PWM resolution (bits) for a given PWM
frequency is equal to:
In order to achieve higher resolution, the PWM
frequency must be decreased. In order to achieve
higher PWM frequency, the resolution must be
decreased. Table 6-1 lists example PWM frequencies
and resolutions for FOSC = 20 MHz. TMRn prescaler
and PRn values are also shown.
TABLE 6-1:
PWM FREQUENCIES AND RESOLUTIONS AT 20 MHZ
REGISTER 6-1:
PWM1 DUTY CYCLE REGISTER MSB (PWM1DCH)
REGISTER 6-2:
PWM2 DUTY CYCLE REGISTER MSB (PWM2DCH)
PWMDC
PWMnDC
()
=*TOSC*TMRn (prescale)
Note:
If the PWM duty cycle value is longer than
the PWM period (PWM duty cycle
= 100%), the PWM output pin will not be
cleared.
log FOSC
() Fpwm
()
() log 2
()bits
()
PWM Frequency
1.22 kHz
4.88 kHz
19.53 kHz
78.12 kHz 156.30 kHz 208.30 kHz
Timer Prescaler (1, 4, 16)
16
4
1
PRn Value
0xFF
0x3F
0x1F
0x17
Maximum Resolution (bits)
10
8
7
5.5
R/W-x
DC1B9
DC1B8
DC1B7
DC1B6
DC1B5
DC1B4
DC1B3
DC1B2
bit 7
bit 0
bit 7-0
DC1B9:DC1B2: Most Significant PWM0 Duty Cycle bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
R/W-x
DC2B9
DC2B8
DC2B7
DC2B6
DC2B5
DC2B4
DC2B3
DC2B2
bit 7
bit 0
bit 7-0
DC2B9:DC2B2: Most Significant PWM2 Duty Cycle bits
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
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