參數(shù)資料
型號： PCM1723E
英文描述： Audio Digital-to-Analog Converter
中文描述： 音頻數(shù)字模擬轉換器
文件頁數(shù)： 3/12頁
文件大?。?/td> 223K
代理商： PCM1723E
2001 Microchip Technology Inc.
DS51140D-page 3
Processor Module and Device Adapter Specification
When the processor power is supplied by the target
application system, an external clock (from the target
board) may also be provided. MPLAB IDE will not allow
use of an external clock without the use of external
power.
3.1.3
OPERATING VOLTAGE OF 4.6 TO 5.5
VOLTS
If the target application system
’
s operating voltage is
between 4.55V (±120 mV) and 5.5V, the Processor
Module will consider this a STANDARD VOLTAGE
condition. In this mode the processor can run to its
highest rated speed (as indicated in its data sheet).
The recommended power-up sequence is:
1.
Apply power to the PC host.
2.
Apply power to the Emulator Pod and Processor
Module assembly.
3.
Invoke MPLAB IDE.
4.
Configure system for Processor Power Supplied
by Target Board through the Power tab of the
Options/Development Mode dialog box.
5.
At the error message, apply power to the target
application circuit. Then acknowledge the error.
6.
Issue a System Reset (from the Debug Menu)
before proceeding.
3.1.4
OPERATING VOLTAGE OF 2.0 TO 4.6
VOLTS
If the target application system
’
s operating voltage is
between 2.0V and 4.55V (±120 mV), the Processor
Module will consider this a LOW VOLTAGE condition.
In this mode the processor is limited to its rated speed
at a given voltage level (as indicated in its data sheet).
To minimize the amount of reverse current that the tar-
get system is exposed to, the recommended power-up
sequence is:
1.
Apply power to the PC host.
2.
Apply power to the Emulator Pod and Processor
Module assembly.
3.
Invoke MPLAB IDE.
4.
Configure system for Processor Power Supplied
by Target Board through the Power tab of the
Options/Development Mode dialog box.
5.
At the error message, apply power to the target
application circuit. Then acknowledge the error.
6.
Issue a System Reset (from the Debug Menu)
before proceeding.
7.
Select
Options > Development Mode
and click
the Power tab. Verify that the dialog says
“
Low
Voltage Enabled.
”
Click
Cancel
to close the dia-
log.
3.2
OPERATING FREQUENCY
The Processor Modules will support the maximum
frequency (except where noted in Section 4.0) of the
device under emulation. Note that the maximum fre-
quency of a PICmicro MCU device is significantly lower
when the operating voltage is less than 4.5V.
The Processor Modules will support a minimum
frequency of 32 kHz. When operating at low frequen-
cies, response to the screen may be slow.
3.3
CLOCK OPTIONS
MPLAB ICE allows internal and external clocking.
When set to internal, the clock is supplied from the
internal programmable clock, located in the Emulator
Pod. When set to external, the oscillator on the target
application system will be utilized.
3.3.1
CLOCK SOURCE FROM EMULATOR
Refer to the
MPLAB ICE User
’
s Guide
(DS51159),
“
Chapter 3, Using the On-Board Clock
”
for configuring
MPLAB IDE to supply the clock source.
3.3.2
CLOCK SOURCE FROM THE TARGET
APPLICATION
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
User
’
s Guide
(DS51159),
“
Chapter 3. Using a Target
Board Clock
”
).
At low voltage, the maximum speed of the processor
will be limited to the rated speed of the device under
emulation.
An oscillator circuit on the Device Adapter generates a
clock to the Processor Module and buffers the clock cir-
cuit on the target board. In this way, the MPLAB ICE
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 4.0. The OSC1 and OSC2 inputs of
the Device Adapter have a 5 pF to 10 pF load. Note 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
described in Section 3.3.1.
3.4
ESD PROTECTION AND ELECTRICAL
OVERSTRESS
All CMOS chips are susceptible to electrostatic
discharge (ESD). In the case of the Processor Mod-
ules, the pins of the CMOS emulator are directly con-
nected to the target connector, making the chip
vulnerable to ESD. Note that ESD can also induce
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