参数资料
型号: KSZ8863FLLI
厂商: Micrel Inc
文件页数: 39/106页
文件大小: 0K
描述: IC ETHERNET SWITCH 3PORT 48-LQFP
标准包装: 250
控制器类型: 以太网开关控制器
接口: MII
电源电压: 1.8V,2.5V,3.3V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-LQFP
供应商设备封装: 48-LQFP(7x7)
包装: 托盘
配用: 576-3866-ND - BOARD EVALUATION FOR KSZ8863FLL
其它名称: 576-3750
PIC16C72 Series
1998 Microchip Technology Inc.
Preliminary
DS39016A-page 37
For an example PWM period and duty cycle calcula-
tion, see the PICmicro Mid-Range MCU Reference
Manual (DS33023).
7.3.3
SET-UP FOR PWM OPERATION
The following steps should be taken when conguring
the CCP module for PWM operation:
1.
Set the PWM period by writing to the PR2 regis-
ter.
2.
Set the PWM duty cycle by writing to the
CCPR1L register and CCP1CON<5:4> bits.
3.
Make the CCP1 pin an output by clearing the
TRISC<2> bit.
4.
Set the TMR2 prescale value and enable Timer2
by writing to T2CON.
5.
Congure the CCP1 module for PWM operation.
TABLE 7-3
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 20 MHz
TABLE 7-4
REGISTERS ASSOCIATED WITH PWM AND TIMER2
PWM Frequency
1.22 kHz
4.88 kHz
19.53 kHz
78.12 kHz
156.3 kHz
208.3 kHz
Timer Prescaler (1, 4, 16)
16
4
1
PR2 Value
0xFF
0x3F
0x1F
0x17
Maximum Resolution (bits)
10
8
7
5.5
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR,
BOR
Value on
all other
resets
0Bh,8Bh
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x 0000 000u
0Ch
PIR1
(1)
ADIF
(1)
SSPIF
CCP1IF
TMR2IF
TMR1IF
0000 0000 0000 0000
8Ch
PIE1
(1)
ADIE
(1)
SSPIE
CCP1IE
TMR2IE
TMR1IE
0000 0000 0000 0000
87h
TRISC
PORTC Data Direction Register
1111 1111 1111 1111
11h
TMR2
Timer2 module’s register
0000 0000 0000 0000
92h
PR2
Timer2 module’s period register
1111 1111 1111 1111
12h
T2CON
TOUTPS
3
TOUTPS
2
TOUTPS
1
TOUTPS
0
TMR2O
N
T2CKPS
1
T2CKPS
0
-000 0000 -000 0000
15h
CCPR1L
Capture/Compare/PWM register1 (LSB)
xxxx xxxx uuuu uuuu
16h
CCPR1H
Capture/Compare/PWM register1 (MSB)
xxxx xxxx uuuu uuuu
17h
CCP1CON
CCP1X
CCP1Y
CCP1M3 CCP1M2 CCP1M1 CCP1M0 --00 0000 --00 0000
Legend:
x
= unknown, u = unchanged, - = unimplemented read as '0'. Shaded cells are not used by PWM and Timer2.
Note 1:
These bits/registers are unimplemented, read as '0'.
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