參數(shù)資料
型號： ENC624J600T-I/PT
廠商： Microchip Technology
文件頁數(shù)： 9/168頁
文件大?。?/td> 0K
描述： IC ETHERNET CTRLR W/SPI 64-TQFP
視頻文件： Fast 100 Mbps Ethernet PICtail Plus Overview
標(biāo)準(zhǔn)包裝： 1,200
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： 64-TQFP
供應(yīng)商設(shè)備封裝： 64-TQFP（10x10）
包裝： 帶卷 (TR)
配用： AC164132-ND - BOARD DAUGHTER PICTAIL ETHERNET
PIC18F2220/2320/4220/4320
DS39599G-page 104
2007 Microchip Technology Inc.
10.2
PORTB, TRISB and LATB
Registers
PORTB is an 8-bit wide, bidirectional port. The corre-
sponding Data Direction register is TRISB. Setting a
TRISB bit (= 1) will make the corresponding PORTB
pin an input (i.e., put the corresponding output driver in
a high-impedance mode). Clearing a TRISB bit (= 0)
will make the corresponding PORTB pin an output (i.e.,
put the contents of the output latch on the selected pin).
The Data Latch register (LATB) is also memory
mapped. Read-modify-write operations on the LATB
register read and write the latched output value for
PORTB.
EXAMPLE 10-2:
INITIALIZING PORTB
Each of the PORTB pins has a weak internal pull-up. A
single control bit can turn on all the pull-ups. This is per-
formed by clearing bit RBPU (INTCON2<7>). The
weak pull-up is automatically turned off when the port
pin is configured as an output. The pull-ups are
disabled on a Power-on Reset.
Four of the PORTB pins (RB7:RB4) have an interrupt-
on-change feature. Only pins configured as inputs can
cause this interrupt to occur (i.e., any RB7:RB4 pin
configured as an output is excluded from the interrupt-
on-change comparison). The input pins (of RB7:RB4)
are compared with the old value latched on the last
read of PORTB. The “mismatch” outputs of RB7:RB4
are OR’ed together to generate the RB Port Change
Interrupt with Flag bit, RBIF (INTCON<0>).
This interrupt can wake the device from Sleep. The
user, in the Interrupt Service Routine, can clear the
interrupt in the following manner:
a) Any read or write of PORTB (except with the
MOVFF (ANY), PORTB instruction). This will
end the mismatch condition.
b) Clear flag bit RBIF.
A mismatch condition will continue to set flag bit RBIF.
Reading PORTB will end the mismatch condition and
allow flag bit RBIF to be cleared.
The interrupt-on-change feature is recommended for
wake-up on key depression operation and operations
where PORTB is only used for the interrupt-on-change
feature. Polling of PORTB is not recommended while
using the interrupt-on-change feature.
RB3 can be configured by the Configuration bit,
CCP2MX, as the alternate peripheral pin for the CCP2
module (CCP2MX = 0).
FIGURE 10-6:
BLOCK DIAGRAM OF
RB7:RB5 PINS
Note:
On a Power-on Reset, RB4:RB0 are con-
figured as analog inputs by default and
read as ‘0’; RB7:RB5 are configured as
digital inputs.
By programming the Configuration bit,
PBADEN (CONFIG3H<1>), RB4:RB0 will
alternatively be configured as digital inputs
on POR.
CLRF
PORTB
;
Initialize PORTB by
;
clearing output
;
data latches
CLRF
LATB
;
Alternate method
;
to clear output
;
data latches
MOVLW
0x07
;
Set RB<4:0> as
MOVWF
ADCON1 ;
digital I/O pins
MOVLW
0xCF
;
Value used to
;
initialize data
;
direction
MOVWF
TRISB
;
Set RB<3:0> as inputs
;
RB<5:4> as outputs
;
RB<7:6> as inputs
Data Latch
From other
RBPU(2)
P
VDD
I/O pin(1)
Q
D
CK
Q
D
CK
QD
EN
QD
EN
Data Bus
WR LATB
WR TRISB
Set RBIF
TRIS Latch
RD TRISB
RD PORTB
RB7:RB5 and
Weak
Pull-up
RD PORTB
Latch
TTL
Input
Buffer
ST
Buffer
RB7:RB5 in Serial Programming Mode
Q3
Q1
RD LATB
or PORTB
Note 1:
I/O pins have diode protection to VDD and VSS.
2:
To enable weak pull-ups, set the appropriate TRIS bit(s)
and clear the RBPU bit (INTCON2<7>).
RB4 pins
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