參數(shù)資料
型號： KSZ8863MLL-EVAL
廠商： Micrel Inc
文件頁數(shù)： 10/106頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR KSZ8863MLL
標準包裝： 1
主要目的： 接口，以太網(wǎng) PHY
嵌入式： 否
已用 IC / 零件： KSZ8863MLL
已供物品： 板
相關產(chǎn)品： 576-3751-ND - IC ETHERNET SWITCH 3PORT 48-LQFP
576-3577-ND - IC ETHERNET SW 3PORT 48-LQFP
其它名稱： 576-3867
2006 Microchip Technology Inc.
DS39564C-page 105
PIC18FXX2
10.1
Timer0 Operation
Timer0 can operate as a timer or as a counter.
Timer mode is selected by clearing the T0CS bit. In
Timer mode, the Timer0 module will increment every
instruction cycle (without prescaler). If the TMR0L reg-
ister is written, the increment is inhibited for the follow-
ing two instruction cycles. The user can work around
this by writing an adjusted value to the TMR0L register.
Counter mode is selected by setting the T0CS bit. In
Counter mode, Timer0 will increment, either on every
rising or falling edge of pin RA4/T0CKI. The increment-
ing edge is determined by the Timer0 Source Edge
Select bit (T0SE). Clearing the T0SE bit selects the ris-
ing edge. Restrictions on the external clock input are
discussed below.
When an external clock input is used for Timer0, it must
meet certain requirements. The requirements ensure
the external clock can be synchronized with the internal
phase clock (TOSC). Also, there is a delay in the actual
incrementing of Timer0 after synchronization.
10.2
Prescaler
An 8-bit counter is available as a prescaler for the Timer0
module. The prescaler is not readable or writable.
The PSA and T0PS2:T0PS0 bits determine the
prescaler assignment and prescale ratio.
Clearing bit PSA will assign the prescaler to the Timer0
module. When the prescaler is assigned to the Timer0
module, prescale values of 1:2, 1:4,..., 1:256 are
selectable.
When assigned to the Timer0 module, all instructions
writing to the TMR0L register (e.g., CLRF
TMR0,
MOVWF
TMR0,
BSF
TMR0,
x
....etc.) will clear the
prescaler count.
10.2.1
SWITCHING PRESCALER ASSIGNMENT
The prescaler assignment is fully under software con-
trol, (i.e., it can be changed “on-the-fly” during program
execution).
10.3
Timer0 Interrupt
The TMR0 interrupt is generated when the TMR0 reg-
ister overflows from FFh to 00h in 8-bit mode, or FFFFh
to 0000h in 16-bit mode. This overflow sets the TMR0IF
bit. The interrupt can be masked by clearing the
TMR0IE bit. The TMR0IE bit must be cleared in soft-
ware by the Timer0 module Interrupt Service Routine
before re-enabling this interrupt. The TMR0 interrupt
cannot awaken the processor from SLEEP, since the
timer is shut-off during SLEEP.
10.4
16-Bit Mode Timer Reads and
Writes
TMR0H is not the high byte of the timer/counter in
16-bit mode, but is actually a buffered version of the
high byte of Timer0 (refer to Figure 10-2). The high byte
of the Timer0 counter/timer is not directly readable nor
writable. TMR0H is updated with the contents of the
high byte of Timer0 during a read of TMR0L. This pro-
vides the ability to read all 16-bits of Timer0 without
having to verify that the read of the high and low byte
were valid due to a rollover between successive reads
of the high and low byte.
A write to the high byte of Timer0 must also take place
through the TMR0H buffer register. Timer0 high byte is
updated with the contents of TMR0H when a write
occurs to TMR0L. This allows all 16-bits of Timer0 to be
updated at once.
TABLE 10-1:
REGISTERS ASSOCIATED WITH TIMER0
Note:
Writing to TMR0L when the prescaler is
assigned to Timer0 will clear the prescaler
count, but will not change the prescaler
assignment.
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
TMR0L
Timer0 Module Low Byte Register
xxxx xxxx
uuuu uuuu
TMR0H
Timer0 Module High Byte Register
0000 0000
INTCON
GIE/GIEH
PEIE/GIEL
TMR0IE
INT0IE
RBIE
TMR0IF
INT0IF
RBIF
0000 000x
0000 000u
T0CON
TMR0ON
T08BIT
T0CS
T0SE
PSA
T0PS2
T0PS1
T0PS0
1111 1111
TRISA
—
PORTA Data Direction Register
-111 1111
Legend: x = unknown, u = unchanged, - = unimplemented locations read as '0'. Shaded cells are not used by Timer0.
相關PDF資料
PDF描述
V150B36E150BL CONVERTER MOD DC/DC 36V 150W
50PX47MEFCTA6.3X11 CAP ALUM 47UF 50V 20% RADIAL
IR3084UMTRPBF IC CTLR XPHASE 28-MLPQ
202D296-25-0 BOOT MOLDED
1812R-104J INDUCTOR UNSHIELDED 100UH SMD
相關代理商/技術參數(shù)
參數(shù)描述
KSZ8863MLLI 功能描述:以太網(wǎng) IC 3-Port Copper 10/100 Ethernet Switch w/ 1x MII Interface (Industrial Grade) 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
KSZ8863RLL 功能描述:以太網(wǎng) IC 3-Port Copper 10/100 Ethernet Switch with 1x RMII Interface (Lead Free) 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
KSZ8863RLL-EVAL 功能描述:以太網(wǎng)開發(fā)工具 3-Port Copper 10/100 Ethernet Switch with 1x RMII Interface - Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓:
KSZ8863RLLI 功能描述:以太網(wǎng) IC 3-Port Copper 10/100 Ethernet Switch w/ 1x RMII Interface (Industrial Grade) 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
KSZ8864CNXCA 功能描述:Ethernet Controller 10/100 Base-T/TX PHY MII, RMII Interface 64-QFN (8x8) 制造商:microchip technology 系列:- 包裝:托盤 零件狀態(tài):有效 協(xié)議:以太網(wǎng) 功能:控制器 接口:MII，RMII 標準:10/100 Base-T/TX PHY 電壓 - 電源:1.8V，2.5V，3.3V 電流 - 電源:- 工作溫度:0°C ~ 70°C 封裝/外殼:64-VFQFN 裸露焊盤 供應商器件封裝:64-QFN（8x8） 標準包裝:348
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*