- 您现在的位置：买卖IC网 > Sheet目录1237 > PMF18WE0 (Microchip Technology)PROCESSOR MODULE FOR ICE4000
MPLAB ? ICE 4000
4.3.2
CLOCK SOURCE FROM THE TARGET
4.5
Freeze Mode
APPLICATION
The MPLAB ICE 4000 system allows the option of
If the target application is selected to provide the clock
source, the target board must also be selected to
power the emulator processor (see the MPLAB ICE
4000 on-line help file in MPLAB IDE ( Help>Topics ) or
the MPLAB ? ICE 4000 User ’s Guide (DS51490),
“Using a Target Board Clock”).
At low voltage, the maximum speed of the processor
“freezing” peripheral operation or allowing them to
continue operating when the processor is halted. This
option is configured in the MPLAB IDE.
This function is useful to halt an on-board timer while at
a break point. At a break point, and while single
stepping, interrupts are disabled.
will be limited to the rated speed of the device under
emulation.
5.0
DEVICE ADAPTERS
An oscillator circuit on the device adapter generates a
clock to the processor module and buffers the clock
circuit on the target board. In this way, the MPLAB ICE
4000 emulator closely matches the oscillator options of
the actual device. All oscillator modes are supported
(as documented in the device’s data sheet) except as
noted in Section 3.0 “Emulator-Related Issues” . The
OSC1 and OSC2 inputs of the device adapter have a
5 pF to 10 pF load. Be aware of this when using a
crystal in HS, XT, LP or LF modes, or an RC network in
RC mode.
The frequency of the emulated RC network may vary
relative to the actual device due to emulator circuitry. If
a specific frequency is important, adjust the RC values
to achieve the desired frequency. Another alternative
would be to allow the emulator to provide the clock as
When using the target board clock, the system’s
operating voltage is between 2.5V and 5.5V.
The MPLAB ICE 4000 device adapters use a serial
EEPROM that is interrogated by MPLAB IDE to
determine what device adapter type and revision is
connected. Using this information, along with the
selected device, MPLAB IDE will determine the device
adapter configuration (i.e., there are no switches or
jumpers to be configured on the device adapters).
Two test points are provided for the use: GND (black)
and VCCME (red).
When target is selected, the “target power” LED will
illuminate on certain adapters to visually indicate Target
Power mode.
Device adapters are specified as DAFXX-N, where XX
denotes the device family (e.g., 18, 30) and N denotes
a number. See the file “Readme for MPLAB ICE
4000.txt” in the MPLAB IDE installation directory for a
list of current device adapters and the devices they
support.
Please see the MPLAB ? ICE 2000/4000 Transition
Socket Specification (DS51194) for transition sockets
4.4
ESD Protection and Electrical
that are used with these device adapters.
Overstress
All CMOS chips are susceptible to electrostatic
discharge (ESD). In the case of the processor modules,
the pins of the CMOS emulator are directly connected
to the target connector, making the chip vulnerable to
ESD. ESD can also induce latch-up in CMOS chips,
causing excessive current through the chip and
possible damage. MPLAB ICE 4000 has been
designed to minimize potential damage by implement-
ing overcurrent protection. However, care should be
given to minimizing ESD conditions while using the
system.
During development, contention on an I/O pin is
possible (e.g., when an emulator pin is driving a ‘ 1 ’ and
the target board is driving a ‘ 0 ’). Prolonged contention
may cause latch-up and damage to the emulator chip.
One possible precaution is to use current limiting
resistors (~100 Ω ) during the development phase on
bidirectional I/O pins. Using limiting resistors can also
help avoid damage to modules, device adapters and
pods that occurs when a voltage source is accidentally
connected to an I/O pin on the target board.
DS51298E-page 4
Preliminary
? 2005 Microchip Technology Inc.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
PMT823004F
GP THREE ELEMENTS S.A. 230V T/H
PPM3-MK2
PROGRAMMER PRODUCTION ISP
PPM3A1-UPG5M
UPGRADE PPM3 RAC DEVELOPMENT
PQ-MDS-PCIEXP
PCI EXPANDER ADAPTOR
PQF-44
PLUG QFP 44PIN (SOLDER DOWN)
PRG18BB471MS1RB
THERMISTOR
PS1600
POWER SUPPLY HOTSWAP 90-245V
PS5100EV
KIT EVALUATION PS5100 W/PS051
相关代理商/技术参数
PMF18WE0
制造商:Microchip Technology Inc 功能描述:Tools Emulator For Use With:P
PMF18WE1
功能描述:插座和适配器 PIC18F8680 RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
PMF18WF0
功能描述:插座和适配器 Processor Module RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
PMF18WH0
功能描述:插座和适配器 PIC18F ICE4000 RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
PMF18WJ0
功能描述:插座和适配器 Processor MOD RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
PMF18WJ1
功能描述:插座和适配器 Processor Module RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
PMF18WK0
功能描述:插座和适配器 PIC18F RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x
PMF18WL0
功能描述:插座和适配器 Processor MOD RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x