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參數資料
| 型號： | PCM17XA0 |
| 英文描述： | PROCESSOR MODULE |
| 中文描述： | 處理器模塊 |
| 文件頁數： | 4/12頁 |
| 文件大?。?/td> | 223K |
| 代理商： | PCM17XA0 |
MPLAB
ICE
DS51140D-page 4
2001 Microchip Technology Inc.
latch-up in CMOS chips, causing excessive current
through the chip and possible damage. MPLAB ICE
has been designed to minimize potential damage by
implementing over-current protection and transient
suppressors. However, care should be given to mini-
mizing ESD conditions while using the system.
During development, contention on an I/O pin is possi-
ble (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
) 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.
3.5
FREEZE MODE
The MPLAB ICE system allows the option of
“
freezing
”
peripheral operation or allowing them to continue oper-
ating when the processor is halted. This option is con-
figured in the MPLAB IDE. The Freeze function is
available on all Processor Modules except the
PCM16XA0.
This function is useful to halt an on-board timer while at
a break point. Note that at a break point and while sin-
gle stepping, interrupts are disabled.
4.0
EMULATOR-RELATED ISSUES
The following general limitations apply to the MPLAB
ICE 2000 Emulator.
All configuration bit settings are enabled/disabled
through
Options>Development Mode
of MPLAB
IDE rather than through MPASM
__CONFIG
directive.
The Reset Processor (
Debug>Run>Reset
) func-
tion in MPLAB IDE will not currently wake the pro-
cessor if it is in SLEEP mode. To wake the
processor, you must use
Debug>System Reset
.
Do not single step into a SLEEP instruction. If you
do step into a SLEEP instruction, you will need to
select
Debug>System Reset
in order to wake up
the processor module.
Initiating a master clear on the MCLR pin will not
reset the processor if you are in step or animate
mode.
Debug > Power On Reset
randomizes GPRs,
(i.e., SFR's are
not
set to POR values). This can
help in debugging. If your application works on the
emulator but not the simulator, try using this fea-
ture.
Device-specific limitations can be found in MPLAB IDE
by selecting
Options > Development Mode
and clicking
the Details button.
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