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參數(shù)資料
| 型號： | ST623x-EMU2 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Real Time Emulation Development Tools for ST6218/ST6228/ST623x MCUs(ST6218/6228/623x的實(shí)時(shí)開發(fā)工具) |
| 中文描述： | 實(shí)時(shí)仿真開發(fā)工具ST6218/ST6228/ST623x微控制器（ST6218/6228/623x的實(shí)時(shí)開發(fā)工具） |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 236K |
| 代理商： | ST623X-EMU2 |
18/20
ST623x-EMU2 - TROUBLESHOOTING
5 TROUBLESHOOTING
5.1 AT POWER UP
At the beginning of an emulation session, on
screen of PC must appear the debugger message
up to the end of software connection establish-
ment.
If a ”TIMEOUT” message is encountered, there is
a connection problem, which can come from one
of these reasons:
with ST6HDS2
– ST6 development Tool is not power ON
– The parallel line is not well connected
or with old main frame:
– verify that the delivered cable is actually con-
nected directly to the Main Frame.
– and if necessary there is another cable which is
either a ”wireto wire” connection or an 25to9 pin
adaptor.
– The serial line is not connected the right I/O port
of the computer.
5.2 DURING EMULATION: PROBLEM WITH
PROGRAM COUNTER
In case of ”Check Hardware Jumpering” or wrong-
ly executing code in step mode:
Most of the time, this problem occurs with HDS1
emulator or with HDS2 plastic BOX up to 4.3 ver-
sion, it iscoming from that the development tool is
in RESET state, it can be caused by:
– The application where probe is connected is not
powered on, thenthe schmitttrigger onpinReset
is active and causes the RESET
– The pin Reset of emulated device is at low level
– A probe is connected, but is not powered either
by an application or by a voltage on the VCC in-
put.
For properly emulating RESET please refer to the
following chapter.
5.3 RESET EMULTATION IN REAL TIME
With ST6HDS2 new metal box, it is now possible
to begin an emulation session even if application is
off, it is required particularly in MONITOR or TV
applications.
With old ST6 HDS1 emulator, or with HDS2 plastic
BOX up to 4.3 Version, if the application requires
that software must be executed just after power
ON, it is mandatory to proceed as follow:
– not connect, or remove probe from application.
– power ON emulator.
– begin emulation session: load program.
– then start execution of program in Real Time.
– plug the probe in the application (which is off), at
this time the ST6 emulator is in reset state, be-
cause Reset and VCC pins are at low level.
– Power ON the application, then the execution of
software will start.
5.4 DISCREPANCIES BETWEEN EMULATOR
AND ROM OR EPROM DEVICE
When some differences of behavior are appearing
between the emulator and the ROM device, in
most cases, it comes from using read/modify/write
instructions on
– registers in which some bits are writable, and
some bits readable.
For these registers, trouble are caused, because
when reading, a random value is read by the CPU,
after calculating the mask, this random value is
written in the register, changing it unintentionally!
The same problem can occur with registers, where
some bits have a different function during writing
or during reading.
Example for Ports:
When reading a bit port in input mode, the read
value is the level of the pin.
When reading a bit port in output, the read value is
the value of the corresponding bit in the Data Reg-
ister.
In case of problems check if each used register is
correctly accessed. The principle ST6 registers
(depending on thefamily), with which care must be
taken, are listed below:
– The EEPROM control registers
– The two control registers of the 2 SPIs
– The Data registers of the 3 Ports A, B and C
– Analog to Digital Converter Control Register
– The Sync Processor
– The 9 PWM D/A control registers
– The 14 bits (PWM+BRM) D/A converter
– The NMI/PWR/VSYNC Interrupt Register
– The Interrupt Option Register
– The Program Rom Pagination Registers
18
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