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参数资料
型号： ENC424J600-I/ML
厂商： Microchip Technology
文件页数： 110/168页
文件大小： 0K
描述： IC ETHERNET CTRLR W/SPI 44-QFN
视频文件： Fast 100 Mbps Ethernet PICtail Plus Overview
标准包装： 45
控制器类型： 以太网控制器（IEEE 802.3）
接口： SPI
电源电压： 3 V ~ 3.6 V
电流 - 电源： 96mA
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 44-VQFN 裸露焊盘
供应商设备封装： 44-QFN（8x8）
包装： 管件
产品目录页面： 684 (CN2011-ZH PDF)
配用： AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET
PIC16CR7X
DS21993C-page 44
2007 Microchip Technology Inc.
5.2
Using Timer0 with an External
Clock
When no prescaler is used, the external clock input is
the same as the prescaler output. The synchronization
of T0CKI, with the internal phase clocks, is accom-
plished by sampling the prescaler output on the Q2 and
Q4 cycles of the internal phase clocks. Therefore, it is
necessary for T0CKI to be high for at least 2Tosc (and
a small RC delay of 20 ns) and low for at least 2Tosc
(and a small RC delay of 20 ns). Refer to the electrical
specification of the desired device.
REGISTER 5-1:
OPTION_REG:
R/W-1
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
bit 7
bit 0
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
bit 7
RBPU: PORTB Pull-up Enable bit (see Section 2.2.2.2 “OPTION_REG Register”)
bit 6
INTEDG: Interrupt Edge Select bit (see Section 2.2.2.2 “OPTION_REG Register”)
bit 5
T0CS: TMR0 Clock Source Select bit
1
= Transition on T0CKI pin
0
= Internal instruction cycle clock (CLKOUT)
bit 4
T0SE: TMR0 Source Edge Select bit
1
= Increment on high-to-low transition on T0CKI pin
0
= Increment on low-to-high transition on T0CKI pin
bit 3
PSA: Prescaler Assignment bit
1
= Prescaler is assigned to the WDT
0
= Prescaler is assigned to the Timer0 module
bit 2-0
PS2:PS0: Prescaler Rate Select bits
000
001
010
011
100
101
110
111
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
1 : 1
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
Bit Value
TMR0 Rate
WDT Rate
Note:
To avoid an unintended device Reset, the instruction sequences shown in Example 5-1 and Example 5-2
must be executed when changing the prescaler assignment between Timer0 and the WDT. This sequence
must be followed even if the WDT is disabled.
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相关代理商/技术参数
参数描述
ENC424J600-IPT 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone 10/100 Ethernet Controller with SPI or Parallel Interface
ENC424J600T-I/ML 功能描述:以太网 IC 10/100 Base-T Stand alone Ethernet Ctrlr RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray
ENC424J600T-I/PT 功能描述:外围驱动器与原件 - PCI 10/100 Base-T Stand alone Ethernet Ctrlr RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray
ENC424J600T-IML 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone 10/100 Ethernet Controller with SPI or Parallel Interface
ENC424J600T-IPT 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone 10/100 Ethernet Controller with SPI or Parallel Interface
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