參數(shù)資料
型號(hào)： ENC424J600-I/PT
廠商： Microchip Technology
文件頁(yè)數(shù)： 6/168頁(yè)
文件大?。?/td> 0K
描述： IC ETHERNET CTRLR W/SPI 44-TQFP
視頻文件： Fast 100 Mbps Ethernet PICtail Plus Overview
標(biāo)準(zhǔn)包裝： 160
控制器類型： 以太網(wǎng)控制器（IEEE 802.3）
接口： SPI
電源電壓： 3 V ~ 3.6 V
電流 - 電源： 96mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 44-TQFP
供應(yīng)商設(shè)備封裝： 44-TQFP（10x10）
包裝： 托盤
產(chǎn)品目錄頁(yè)面： 684 (CN2011-ZH PDF)
配用： AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET
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2007 Microchip Technology Inc.
DS39599G-page 101
PIC18F2220/2320/4220/4320
10.0 I/O PORTS
Depending on the device selected and features
enabled, there are up to five ports available. Some pins
of the I/O ports are multiplexed with an alternate func-
tion from the peripheral features on the device. In gen-
eral, when a peripheral is enabled, that pin may not be
used as a general purpose I/O pin.
Each port has three registers for its operation. These
registers are:
TRIS register (Data Direction register)
PORT register (reads the levels on the pins of the
device)
LAT register (Data Latch)
The Data Latch (LAT register) is useful for read-modify-
write operations on the value that the I/O pins are
driving.
A simplified model of a generic I/O port without the
interfaces to other peripherals is shown in Figure 10-1.
FIGURE 10-1:
GENERIC I/O PORT
OPERATION
10.1
PORTA, TRISA and LATA
Registers
PORTA is an 8-bit wide, bidirectional port. The corre-
sponding Data Direction register is TRISA. Setting a
TRISA bit (= 1) will make the corresponding PORTA pin
an input (i.e., put the corresponding output driver in a
high-impedance mode). Clearing a TRISA bit (= 0) will
make the corresponding PORTA pin an output (i.e., put
the contents of the output latch on the selected pin).
Reading the PORTA register reads the status of the
pins, whereas writing to it, will write to the port latch.
The Data Latch register (LATA) is also memory mapped.
Read-modify-write operations on the LATA register read
and write the latched output value for PORTA.
The RA4 pin is multiplexed with the Timer0 module
clock input and one of the comparator outputs to
become the RA4/T0CKI/C1OUT pin. Pins RA6 and
RA7 are multiplexed with the main oscillator pins; they
are enabled as oscillator or I/O pins by the selection of
the main oscillator in Configuration Register 1H (see
they are not used as port pins, RA6 and RA7 and their
associated TRIS and LAT bits are read as ‘0’.
The other PORTA pins are multiplexed with analog
inputs, the analog VREF+ and VREF- inputs and the com-
parator voltage reference output. The operation of pins,
RA3:RA0 and RA5, as A/D converter inputs is selected
by clearing/setting the control bits in the ADCON1 reg-
ister (A/D Control Register 1). Pins RA0 through RA5
may also be used as comparator inputs or outputs by
setting the appropriate bits in the CMCON register.
The RA4/T0CKI/C1OUT pin is a Schmitt Trigger input
and an open-drain output. All other PORTA pins have
TTL input levels and full CMOS output drivers.
The TRISA register controls the direction of the RA pins
even when they are being used as analog inputs. The
user must ensure the bits in the TRISA register are
maintained set when using them as analog inputs.
EXAMPLE 10-1:
INITIALIZING PORTA
Data
Bus
WR LAT
WR TRIS
RD PORT
Data Latch
TRIS Latch
RD TRIS
Input
Buffer
I/O pin(1)
Q
D
CK
Q
D
CK
EN
QD
EN
RD LAT
or PORT
Note 1:
I/O pins have diode protection to VDD and VSS.
Note:
On a Power-on Reset, RA5 and RA3:RA0
are configured as analog inputs and read
as ‘0’. RA4 is configured as a digital input.
CLRF
PORTA
;
Initialize PORTA by
;
clearing output
;
data latches
CLRF
LATA
;
Alternate method
;
to clear output
;
data latches
MOVLW
0x0F
;
Set all A/D pins as
MOVWF
ADCON1 ;
digital I/O pins
MOVLW
0xCF
;
Value used to
;
initialize data
;
direction
MOVWF
TRISA
;
Set RA<3:0> as inputs
;
RA<5:4> as outputs
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ENC424J600T-I/ML 功能描述:以太網(wǎng) IC 10/100 Base-T Stand alone Ethernet Ctrlr RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
ENC424J600T-I/PT 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 10/100 Base-T Stand alone Ethernet Ctrlr RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
ENC424J600T-IML 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Stand-Alone 10/100 Ethernet Controller with SPI or Parallel Interface
ENC424J600T-IPT 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Stand-Alone 10/100 Ethernet Controller with SPI or Parallel Interface
ENC431D05A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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