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ST624xB-EMU2
REAL TIME EMULATION
DEVELOPMENT TOOLS FOR ST624x MCUs
HARDWARE FEATURES
■ Supports ST62 and ST63 family
■ Real time emulation
■
32 KBytes of emulation memory
■ Breakpoint ona single address or onan address
area
■ Break events canbe defined on Program Space,
Data space mixed with up to 4 external signals
■ 2 full programmable output for synchronisation
■ Read/Write registers on the fly (without wait
state)
■
Selective trace in Range or Start/Stop
■ Break on Stack Overflow
■ 1K of real trace memory
■
Tracing of up to 32 bits including 4 external
signals
SOFTWARE FEATURES
■ Symbolic debugger at source level
■ On-line assembler/disassembler
■
Log files capable ofstoringany displayed screen
■ Commandfilesableto execute asetof debugger
commands
July 1998 1/21
This isadvanceinformation from STMicroelectronics.Details are subject tochangewithout notice.
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Table of Contents
ST624xB-EMU2 . . . . . . . . . .............................1
1 DELIVERY CHECK . . . . . . . . . . . .................................................4
2 ST6 HDS2 NEW MAINFRAME EMULATOR . . ......................................5
2.1 MAIN BOARD . . . . .......................................................6
2.2 ST6 HDS2 MAIN BOARD . . . ...............................................6
2.2.1 External output: OUT1and OUT2. . . ....................................6
2.2.2 Data acquisition signals . . . ...........................................7
2.2.3 LEDsRUN,STOP,WAIT .............................................7
2.3 INSTALLING AN ST6 EMU2 DEVELOPMENT TOOL. . . . . . . . . . . . . . . . .............7
2.4 INSTALLING A DEDICATION BOARDIN AN ST6 HDS2. . . . . . . . . . . . . . ............7
2.5 COMPONENTS LAYOUT OF ST6 MAIN BOARD (MB097) . . . . . . . . ................8
2.6 COMPONENTS LAYOUT OF ST6 MAIN BOARD (MB174) . . . . . . . . ................9
3 ST6 MAINFRAME EMULATOR (FIRST GENERATION)..............................10
3.1 CLZ80BOARD..........................................................10
3.2 GPFM/3BOARD ........................................................10
3.3 INTERFACE BOARD . . .. . . . . . . ...........................................11
3.4 INSTALLING AN ST6 HDS1 DEVELOPMENT TOOL. . . . . . . . . . . . . . . . ............11
3.5 INSTALLING A DEDICATION BOARDIN AN HDS1 DEVELOPMENT TOOL. . . . . . . . . 11
4 DEDICATION BOARD (DBE) . . . . ...............................................12
4.1 VOLTAGE FUNCTIONING RANGE..........................................12
4.2 JUMPER DESCRIPTION ON DEDICATION BOARD . . . . ........................13
4.2.1 VAPLI-PULLUP: default value on output buffers W11 . . . . . .................13
4.2.2 Clock Source Selection: W2 ..........................................13
4.2.3 Reset delay duration: W3 . . . . . . . . . . . . . . . . . . . . ........................13
4.2.4 Mask option on Timer 1: W4 named PUPTIM1. . . . . . . . . . . . . . . . ............13
4.2.5 Bank RAM/EEPROM selection: W4 named RPG0, RPG1. .. . ...............14
4.2.6 ROM Program Size selection: option on W5 named ROM. . . . ...............14
4.2.7 Timer 2 Enable/Disable: option on W5 named TIM2. . . . . . . . . . . . . . ..........14
4.2.8 Watchdog: W5 named WD . . . . . . .....................................14
4.2.9 Mask option on NMI Input: W5 named PUPNMI. . . . .......................14
4.2.10 Real Time Clock Enable/Disable: option on W5 named RTC.................14
4.2.11 Combiports, Real Time clock selection: W8, W9 . . . . ......................15
4.2.12 W1 (EPLD): reserved ...............................................15
4.2.13 Internal Oscillator frequency selection: W6, W7 . . . ........................15
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Table of Contents
4.3 PROBE: THE SCHRINK DIP 56 . . . . . . . . . . . . . . . . . . . . ........................16
4.4 PROBE: INSTALLING THE FERRITE COIL FOR EMC COMPATIBILITY . . . . . . . . . . . . 16
4.5 EMULATED PERIPHERALS . . . ............................................16
4.5.1 ProgramRom .....................................................16
4.5.2 Data Space Memory . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . . . ................16
4.5.3 Timer 1, Timer 2, SPI, Watchdog ......................................16
4.5.4 Analog to Digital Converter . ..........................................17
4.5.5 PortA ...........................................................17
4.5.6 PortB ...........................................................17
4.5.7 Port C: combiports. .................................................17
4.5.8 32 Khz Oscillator . . . . ...............................................18
4.5.9 LCDDRIVER .....................................................18
5 TROUBLESHOOTING ........................................................19
5.1 ATPOWERUP .........................................................19
DURING EMULATION: PROBLEM WITH PROGRAM COUNTER. . . ..............19
5.2
5.3 RESET EMULTATION IN REAL TIME. . . . . ...................................19
5.4 DISCREPANCIES BETWEEN EMULATOR AND ROM OR EPROM DEVICE. . . . . . . . . 19
5.5 AVOID THE MOST FREQUENT PROBLEMS WHEN PROGRAMMING ST6 MICROS!. 20
5.5.1 Execution of Interrupt ...............................................20
5.5.2 Execution of WAIT and STOP instructions . . . .. . . . . . . . . . . ................20
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ST624xB-EMU2 - DELIVERY CHECK
1 DELIVERY CHECK
This development tool is able to emulate all components belonging to the ST624BX family, it is
able also to emulate the old ST624X family devices.
The choice of emulated ROM Device is made either by properly setting the configuration on the
dedication board or by software when using the
new Debugger WGDB6under WindowsTM, and by
connecting the appropriate PROBE on the dedication board through the flat cables.
When receiving a whole ST624XB development
tool or a ST624XB-DBE please refer to the
“PRODUCT DELIVERY” to check the content of
the package.
Instructions for use - Warning
This development tool conforms with theEN55022
emissions standard for ITE, and with generic
50082-1 immunity standards. Then, it complies
with the 89/336/EEC directive.
The product is a A Class apparatus. In a residential environment this device may cause radioelectrical disturbance which may require that the user
adopts appropriate precautions.
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ST624xB-EMU2 - ST6 HDS2 NEW MAINFRAME EMULATOR
2 ST6 HDS2 NEW MAINFRAME EMULATOR
The new ST6 HDS2 mainframe (with MB097 main
Board) has been designed to replace the HDS1
version. The main modifications are:
– Communication transfer rate: it is now muchfast-
er thanks to the use of parallel port.
– Dimension and weight: the old 3 boards, basic
part of the system, have been redesigned in one
board.
– The cost of the overall system has been well re-
duced.
In the second version of ST6 HDS2, (metal box
with MB174 main Board) modified for CEM conformity, these new features have been introduced:
– Read/ Write registers on the flyduring execution
of program without any wait state.
– Selective record of bus in logical analyser in
Range or Start/Stop mode.
– Output OUT1 and OUT2 for synchronisation of
an external equipment, programmable in the
same way as Selective trace, in Range or Start/
Stop mode.
Figure 1.Hardware Development System Emulator
– Stack overflow: a break is automatically generat-
ed (by default) in case of stack overflow.
– Break execution: in this new version, the pro-
gram stops before the execution of the fetch.
These main frame consist of a basic part, common
to all ST6 devices, and one ST62 or ST63 sub
family dedicated board depending on the specific
device to emulate. This new emulator is full compatible with existing dedicated boards, excepting
ST631XX-DBE which have been designed in 2
boards.
Only the dedicated board has to be changed to
emulate a new device within the ST62/ST63 sub
families.
The use of parallel port allows a very faster communication transfer rate. The symbolic debugger,
software part of the real time emulation tool, can
be run on a PC, and is common to all ST62 and
ST63 devices.
The debugger uses a windowed menu driven interface, and enables the user to set the configuration of the emulator.
HARDWARE DEVELOPMENT SYSTEM
EMULATOR (HDS2)
Dedication Board
Power
ST6probe
Triggers
OUT-2OUT-1
Parallel Port connection
Stop Wait Run
ST6 HDS2
EMULATOR (.EMU2)
1234
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ST624xB-EMU2 - ST6 HDS2 NEW MAINFRAME EMULATOR
2.1 MAIN BOARD
The Main board controls the emulator thanks to a
ST9 central processing unit which executes commands coming from host computer through the
parallel line.
The board contains all emulation resources, the
core of the ST6, the Program ROM emulation, the
break point logic, the trace memory, the automaton and all necessary logic for a real time emulation.
Two connectors, J1 and J2, are used to exchange
signals with the dedication board.
The amount of program memory in the main board
is factory set at 32k,in fact the size of the memory
depends on the dedication board, which contains
the Program Rom Pagination Register (PRPR) if it
exists (no PRPR for memory size lower than 4k).
No configuration jumpers are required.
2.2 ST6 HDS2 MAIN BOARD
On the rear panel there is:
– a power plug to connect power: 5 Volts 3 Amp
min. (The delivered power is 100 volts to 240
volts input and 5 Amp output).
– a power switch.
– a parallel connector for an IBM PC(TM) compat-
ible.
On front panel:
– a led “POWER ON” signal.
– OUT 1 and OUT2 signals which can be used for
synchronizing an external equipment.
– 2 leds indicating whentheST6 core is in “STOP”
or “WAIT” mode.
– a 16 pin connector for data acquisition signals.
The explanation of these signals is done in the
debugger manual.
2.2.1 External output: OUT1 and OUT2
For debugging hardware it is very useful to have
synchronization signals. The goal of the outputs 1
and 2 is to offer this feature to the user. They can
be programmed differently whether the debugger
used is the DOS debugger ST6NDB or the Source
Level Debugger WGDB6, as explained in the two
following paragraph. They are full programmable
with WGDB6.
Output OUT1 and OUT2 under ST6NDB
When using old DOS Version of debugger
ST6NDB:
This feature is programmable thanks to Hardware
Breakpoint Menu. The breakpoint MENU allows to
define breaking events. These events will generate an actual breakpoint only if break enable is
ON. When break is off, these events are existing in
the development tool. In the HDS2 emulator version up to 4.3, the signals OUT1 and OUT2 are
connected to these internal breaking events.
Therefore these signals can be used to synchronize an external device while running (breakpoint
off).
Output OUT1 and OUT2 under WGDB6
When using WGDB6 new Version of debugger at
source level under WindowsTM:
This feature is full programmable thanks to Hardware Events/Trigger Menu. Output OUT1 and
OUT2 can be programmed in two ways:
– Events for synchronisation: it allows to the user
to preset pulses synchronisation for an external
equipment. The events can be defined by addresses or by range of addresses.
– Events for Timing Measure: it allows tothe user
to measure time elapsed during a subroutine for
example. In this case, output OUT2 is SET on a
user defined address, and RESET on an other
one, OUT1 is the ST6 clock cycle gated by
OUT2.
These 2 functioning modes are clearly displayed
on screen.
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ST624xB-EMU2 - ST6 HDS2 NEW MAINFRAME EMULATOR
2.2.2 Data acquisition signals
In a same way as are recorded Buses, Flags,
Bank registers in thetrace memory, the ST6 HDS2
offers the possibility to record 4 external signals.
These signals must be connected on the pin
1,3,5,7 of the Analyser probe connector on the
front panel of the HDS2,as shown below. A flatcable with probe tip is delivered with the emulator.
These inputs are CMOS compatible at 5 Volts
.
V
CC
Caution:
+5V EMU
GND
1
AL3 AL2 AL1 AL0
2.2.3 LEDs RUN, STOP, WAIT
Three leds have been added to indicate to the
user the state of the core or of the development
tool during emulation.
First at power up, the red led is ON and becomes
OFF after a few time. It lights one short time during
connection establishment between ST6 HDS2
emulator and host computer. After that, the Run
led must be OFF.
If the LED RUN remains ON after power up, it will
cause a default in initialisation of emulator, thisdefault can be caused by:
– The emulation is in Reset: if the emulator is con-
nected on a target application, this application
must have been powered before.
– There is no clock: see chapter about clock
source selection.
After a correct initialisation:
When user’s program is running (in real time), led
RUN is on.
When ST6 core is in WAITmode, led WAIT is ON.
When ST6 core is in STOP mode, both leds STOP
and WAIT are ON.
2.3INSTALLINGAN ST6 EMU2 DEVELOPMENT
TOOL
– When receiving a whole development tool, the
dedication board is delivered inside the main-
frame.
– You have just to:
– connect the power supply to the mains(100 to
240 volts).
– connect the output (5Volts) of power supply on
the DIN connector of the rear panel
– connect the parallel cable between the parallel
connector and the host computer.
For installing the probe, please refer to the appro-
priate item in the Dedication Board chapter.
2.4 INSTALLING A DEDICATION BOARD IN AN
ST6 HDS2
If there is already a dedication board in the development tool, you have simply to:
– unscrew the 2 screws on each side of the dedi-
cation board, and press outward on the release
buttons to extract the board.
Then insert the new dedication board in the guide
rods and push it hardly in the backplane, and:
– screw the 2 screws on each side of the dedica-
tion board.
For installing the probe, please refer to the chapter
“Installing the probe”.
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ST624xB-EMU2 - ST6 HDS2 NEW MAINFRAME EMULATOR
2.5 COMPONENTS LAYOUT OF ST6 MAIN BOARD (MB097)
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VR02091A
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ST624xB-EMU2 - ST6 HDS2 NEW MAINFRAME EMULATOR
2.6 COMPONENTS LAYOUT OF ST6 MAIN BOARD (MB174)
VR02091U
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ST624xB-EMU2 - ST6 MAINFRAME EMULATOR (FIRST GENERATION)
3 ST6 MAINFRAME EMULATOR (FIRST GENERATION)
The ST6 mainframe emulator contains positions
for 5boards :
– CLZ80 board must be inserted on the first (bot-
tom) position
– GPFM/3 board must be on second position
– interface N (DB014) must be inserted on third
position
– dedication board ST638X (MB167) inserted in
one of the two top position
On the rear panel there is :
– a main-power selector to select 110 voltsor 220
volts.
– a power plug
– a power switch
On front panel :
– the RS232 connector to link theemulator with an
IBM PC
– EXT-SIG connector that allows you to choose
between 3 groups of4 signalsto be memorize on
trace memory. These signals are independent
from the probe data acquisition signals. The ex-
planation of these signals is done in thedebug-
ger manual
– Z80 reset push button
– ST6 INT push-button
3.1 CLZ80 BOARD
The CLZ80 board controls the mainframe emulator and it is linked to an IBM PC through an RS232
line. On this board only 2 connectors are used :
– J5 connected to the front panel RS232 25 pin
connector
– J4 connected to the front panel Z80-RESET
push-button
3.2 GPFM/3 BOARD
GPFM/3 board contains the emulation resources :
Program ROMemulation, break point, trace mem-
ory.
Two connectors, J3 and J4, are used to exchange
signals with the interface board.
When emulating ST62XX or ST63XX, the inter-
face board is an N-WELL interface board.
The two connectors are used.
For emulating components of other families, the
interface board can be a P-WELL interface board:
in this case only one connector is used, the jumpers of W2 must be plugged.
JUMPERS SETTING for ST62XX and ST63XX
emulation:
W1:
All jumpers must be removed.
W2 :
One jumper only must beset to link pin 1 to pin 16.
CONNECTORS :
J3 and J4 :
Used to link this board with the N-WELL interface
board.
J5 :
Used to connect the data acquisition probe.
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ST624xB-EMU2 - ST6 MAINFRAME EMULATOR (FIRST GENERATION)
3.3 INTERFACE BOARD
The interface board emulates the CPU-core.
JUMPERS SETTINGS:
S1
:
– not used in emulation mode
– allows the definition of the type of EPROM
(27256/27128) used in stand-alone (without
CLZ80 and GPFM/3 boards) mode
S2, S3
: size of emulation program ROM
The position reference names depend on the version of the board. For S2 they can be identified as
0 and 1 or OLD and NEW on the board.
For S3 it can be 0 and 1 or 4K and 8K.
S2 S3 Size Comment
0orOLD 0or4K 4K
0orOLD 1or8K 8K
1 or NEW 0 or 4K 16K
1 or NEW 1 or 8K 32K
normal set-
ting
not support-
ed
– remove the 2 screws on the rear panel of the
main frame
– lift the lid on the side of the rear panel
– pull the lid from the rear panel, it dissociates it
from the front panel
– remove the lid, pay attention to the wire for the
ground connection
Verify that all boards are correctly inserted in the
backplane of the mainframe in the right order:
– CLZ80 board must be inserted on the first (bot-
tom) position
– GPFM/3 board must be on second position
– Interface N (DB014) must be inserted onthird
position
– The two top positions are intended to receive
one or a couple of dedication boards in order to
emulate one family ofcomponents: in this case,
only the new DBE board must be in one of the
two top positions.
For installing the probe, please refer to the appro-
priate chapter in the Dedication Board part.
After installation of a probe, the flat cables must
be parallel.
The purpose of this jumper isto allow the emulator
to check the amount of emulation program ROM
that is used.
TEST/NO TEST: must be in NO TEST position
CONNECTORS:
J1 and J4 to link this board to GPFM/3 board.
J2: receives signals from J1-EXT SIG. connector
situated on the front panel of the ST6 emulator.
J3: is connected to ST6-RESET, ST6-INT push-
buttons, STOP-LED and WAIT-LED situated on
the front panel of the ST6 emulator.
3.4 INSTALLING AN ST6 HDS1 DEVELOPMENT
TOOL
When receiving a whole development tool, the
dedication board is delivered inside the mainframe, it is plugged in one of the two top position in
the backplane.
– First of all, it ismandatory to verify the main-
frame:
3.5 INSTALLING A DEDICATION BOARD IN AN
HDS1 DEVELOPMENT TOOL
When receiving only a dedication board, this board
must be installed as described below.
Open the main frame by removing the lid:
– remove the 2 screws on the rear panel of the
main frame
– lift the lid on the side of the rear panel
– pull the lid from the rear panel, it dissociates it
from the front panel
– remove the lid, pay attention to the wire for the
ground connection
Then remove the dedication board or the two ded-
ication board which are plugged in the two top position of the backplane.
After that, plug the new dedication board in one of
the two top positions of the backplane.
For installing the probe, please refer to the appropriate item in the Dedication Board chapter.
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ST624xB-EMU2 - DEDICATION BOARD (DBE)
4 DEDICATION BOARD (DBE)
This board contains the specific functions for
ST624X emulation:
– EEPROM (Byte mode and parallel mode)
–RAM
– Timer 1
– Timer 2
– Watchdog
– Analog to Digital Converter
– Serial Peripheral Interface
– Analog to Digital Converter
– Port A: 8 Bits
– Port B: 8 Bits
– Port C:8 Bits (Combiports) in alternate function
with LCD segments
– 32 Khz oscillator
– LCD Driver
– Power Supply Supervisor
– External non Maskable Interrupt
– Pagination Registers
A white dot indicates the position 1 for all jumpers
and components on the board.
Note for the VCC pin:
When the input power pin VCC is connected, this
input is used as a reference voltage by the emulator.(please refer to the 5-1 chapter)
No power is given or taken at this pin by the emulator.
Notes onwrite-only registers:
Several Data Space registers of the emulated
ROM device are write-only, however, to offermore
flexibility to the user, they are readable when commands such as “watching register” are used.
4.1 VOLTAGE FUNCTIONING RANGE
The new ST624XB-DBE board has been designed
to emulate the ROM device in the range of 3 to 6
Volts.
When the input power VCC pin is connected, this
input is used as a reference voltage by the emulator. This reference voltage is amplified thanks to
an operational amplifier and an emitter follower for
powering the output buffers, and for giving the
high reference voltage to the ADC and the Power
Supply Supervisor.
Then all the outputs of the peripherals are fully
compatible at CMOS level with an application
which is powered in therange from 3 to 6 Volts.
When VCC Pin is not connected, it is mandatory to
close W11 Jumper (see 5.2 chapter) in order to
power all buffers with 5 volts, it permits to use emulator without target application.
No power is given nor taken at this pin by the emulator.
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ST624xB-EMU2 - DEDICATION BOARD (DBE)
4.2 JUMPER DESCRIPTION ON DEDICATION
BOARD
Jumpers on the board are used to select the
amount of Data Space MEMORY, the emulated
PERIPHERALS, and metal MASK OPTION of the
ROM device.
After powering the system,theoptions taken in account by the DBE are the jumpers of the board.
Thanks to the new debugger WGDB6 under windowsTM, the options can be either the set of jumpers on board, oroptions chosen bysoftware. In the
menu command then submenumicroconfiguration,
the user can chose new options and then select
Software configuration, or eventually return to the
hardware configuration.
The difference between the ROM devices belonging to the ST624X family are as follow:
– The ST6240 is the most powerful device, it con-
tains all peripherals, and all possible resources
are bounded on pins.
– The ST6242, ST6245 and ST6246 are subsets
of ST6240, some peripherals are not available,
some resources are not bounded and the
amount of Program and Data Space memory is
different.
To emulate a specific Device, the user must set
options according to the data sheet of this device.
When a peripheral is not used, for example Timer
2 for ST6242, registers of this peripheral are at
zero value, and they cannot be written.
This chapter explains how toselectthese features.
4.2.1 VAPLI-PULLUP: default value on output
buffers W11
When VCC Pin is not connected, it is mandatory to
close W11 Jumper in order to power all buffers
with 5 volts, it permits to use emulator without target application. When the probe is on the target
application the pullup resistor can intruce an error
particularly when using A/D converter (High reference of A/D is VCC).
4.2.2 Clock Source Selection: W2
The systemCLOCK can be chosen between internal oscillator and clock issued from the probe. This
jumper setting is clearly printed on board, with INT
for INTERNAL clock and EXT for clock issued
from the probe.
If the jumper is connected between:
1-2 In this case the clock of the probe is se-
lected
2-3 (factory setting) The internal clock is se-
lected.
In this case the internal clock is made thanks to an
oscillator with a 8 MHz crystal.
Note for CLOCK “issued from the probe”:
If the user uses a probe made by SGS-THOM-
SON, this probe is able to send a clock to the dedication board in two ways:
– a clock made by the on board oscillator on the
probe.
– a clock directly issued from the application. In
this case the signalon OSCIN must beat CMOS
level.
For more details,please refer to the ST6246 probe
chapter or to the documentation delivered with the
QFP probe.
WARNING on probe on board oscillator:
– QFP Probes: Because of parasitic capacitors
due to connections, it ismandatory to notuse the
on board oscillator of the QFP Probes, or eventually to adapt components to the application,
and verify the signal with an oscilloscope.
– ST6246B (SDIL56) probe: this board has been
designed to avoidthe problem ofparasitic capacitors: the “open” schematic permits to the user to
reconstruct on the probe, the same oscillator as
on his own application. The probe is able to support a crystalor aresonator 3 pinswith or without
capacitor, it can be of course used also with an
RC.
4.2.3 Reset delay duration: W3
For as long as the reset pin is kept at the low level,
the processor remains in the reset state.
After the pin reset has been released, a counter
provides a delay between the detection of the reset high level and the release of the MCU reset:
the jumper on W3 named buildup counter permits
to select the duration of this delay.
The standard delay is 2048 oscillator cycles: the
jumper must be in front of 2 (factory setting).
For delay of 4096, 8192 or 16384 the jumper must
be in front of respectively 4, 8, or 16, clearly printed on the board.
4.2.4 Mask option on Timer 1: W4 named
PUPTIM1
The pin of the timer 1 can be pulled up by a 100k
resistor.
This resistor is connected to the timer 1 input by a
jumper named PUPTIM1 on W4 selector.
– If Jumper PUPTIM1 is on the side “EN”: Timer
pin is pulled up by 100k.
– If Jumper PUPTIM1 is on the side “DIS”: Timer
pin is not pulled up.
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ST624xB-EMU2 - DEDICATION BOARD (DBE)
4.2.5 Bank RAM/EEPROM selection: W4named
RPG0, RPG1
If the user wants to be sure to not use to much of
available memory RAM according to his chosen
device, he can ENable/DISable indepently the 4
bits of Data RAM/EEPROM Bank register: DRBR.
The factory Jumper setting corresponds to the
most powerful device.
For EEPROM:
– If Jumper EPG0 (EEPROM page 0) ison the
side “EN”: Bit 0 of DRBR is valid (01).
– If Jumper EPG1 (EEPROM page 1) ison the
side “EN”: Bit 1 of DRBR is valid(02).
For RAM:
– If Jumper RPG1 (RAM page 1) is on the side
“EN”: Bit 3 of DRBR is valid (08H).
– If Jumper RPG2 (RAM page 2) is on the side
“EN”: Bit 4 of DRBR is valid (010H).
If Jumper is on the side DISable, the correspond-
ing Bit is forced to “0”, causing an non access to
memory.
4.2.6 ROM Program Size selection: option on
W5 named ROM
If the user wants to be sure to not use to much of
available memory ROM according to his chosen
device, he can select the “small” size of memory:
4K.
The ROM memory size is set thanks to W5 selector onpart named ROM:
– If Jumper ROM is on the side “4K”: the amount
of available ROM is 4K.
– If Jumper ROM is on the side “8K”: the amount
of available ROM is 8K.(Factory setting)
When program memory size is 4 k Bytes, it means
that all bits of Program Rom Pagination Register
are at zero value and are not able to be written.
When program memory size is valid up to 8 k
Bytes: it means that Bit 0 and 1 of Program Rom
Pagination Register are available.
4.2.7 Timer 2 Enable/Disable: option on W5
named TIM2
The explanation of W5 selector, isexplained clearly on the board, on the left side, when regarding
the front panel of the board.
ENABLE
DISABLE
TIM2
HS
WD
PUPNMI
RTC
ROM 4K
8K
W5W5
If the user wants tobe sure to not use theTimer 2,
case of emulating the ST6242 device, the user
must set the jumper on DISable position.
The option Enabling/Disabling the Timer 2 is set
thanks to W5 selector on part named TIM2:
– If Jumper TIM2 is on the side “EN”: Timer 2 is
valid.
– If Jumper TIM2 is on the side “DIS”: Timer 2 is
not valid, its registers remain at reset state.
4.2.8 Watchdog: W5 named WD
The explanation of W5 selector, isexplained clearly on the board, on the left side, when regarding
the front panel of the board.
For the ST624X family, this option is not used, because the current devices have a dedicated input.
The dedicated input exists for ST6240 device, but
is internally pulled upfor others devices, it is corresponding to SOFTWARE WATCHDOG.
4.2.9 Mask option on NMI Input: W5 named
PUPNMI
The NMI Input can be pulled upby a 100k resistor.
This resistor is connected to the NMI input by a
jumper named PUPTIM1 on W5 selector.
– If Jumper PUPNMI is on the side “EN”: NMI input
is pulled up by 100k.
– If Jumper PUPNMI is on the side “DIS”: NMI In-
put is not pulled up.
4.2.10 Real Time Clock Enable/Disable: option
on W5 named RTC
The option Enabling/Disabling the RTC is set
thanks to W5 selector on part named RTC:
– If Jumper RTC is on the side “EN”: RTC is valid.
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ST624xB-EMU2 - DEDICATION BOARD (DBE)
– If Jumper RTC is on the side “DIS”: RTC is not
valid, its registers remain at reset state.
4.2.11 Combiports, Real Time clock selection:
W8, W9
The option Enabling/Disabling the Combiports or
the RTC is set thanks to W8 and W9 jumpers:
The figure below shows the Factory setting for
these jumpers, which is Enable.
W6 W9
CLK8/2
CLK8/4
4/1
2/1
W8
A
B
W9
DISable ENable
PSS or Combiport
4.2.12 W1 (EPLD): reserved
This jumper is reserved for a future use, therefore
it must be on LOW.
4.2.13 Internal Oscillator frequency selection:
W6, W7
The new ST624XB-DBE offers to the user to
chose an internal frequency lower than 8 MHz.
The 4 possibilities are: 1MHz, 2 MHz, 4MHz,
8MHz.
The selection is made as below:
8MHz
4 MHz
2 MHz
1 MHz
CLK8/2
CLK8/4
CLK8/2
CLK8/4
CLK8/2
W6
W6 W9
4/1
2/1
A
B
4/1
2/1
A
B
4/1
W6 W9
W6 W9
W7
W6
W7
W6
CLK8/2
CLK8/4
CLK8/4
W6
W6 W9
4/1
2/1
A
B
W7
A
B
2/1
W7
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ST624xB-EMU2 - DEDICATION BOARD (DBE)
4.3 PROBE: THE SCHRINK DIP 56
This probe is always delivered with the Dedication
Board. It has been designed to emulate the
ST6246B device or a subset of same footprint.
With this new probe, itis possible to recontitute an
oscillator at the same frequency as on application:
an onboard oscillator, designed in an “open” schematic permits to place on the probe, the Crystal or
the resonator or an RC as on target application.(see schematic in Annex).
When using clock generated byprobe, the dedication board must be set in EXTernal clock.
Two Selectors permit to configure the probe:
W1: Choice between on board oscillator or Oscin.
– Ifthe user wantstouse the on board oscillatorhe
must place the jumper on: Oscillator.
– If the user wants to use a clock coming from ap-
plication at CMOS level onOSCIN input: the user
must place the jumper on OSCIN.
W2: Disable oscillator
If theuser do not use the oscillator, it is preferable
to disable it for noise and EMC reason. (Jumper
W2 forces input oscillator to “0”)
4.4 PROBE: INSTALLING THE FERRITE COIL
FOR EMC COMPATIBILITY
To be conform to the EMC directive, particularly in
emission, the delivered ferrite coil must be placed
as follow:
1) Place each part on each side of the flat cables
2) Place the metal clip to fix them together
1
2
2
ST6 probe
1
4.5 EMULATED PERIPHERALS
4.5.1 Program Rom
The program ROM sizefor ST624XB or ST624X is
4 K or 8 K.
4.5.2 Data Space Memory
The memory available in range 0 to 3F in data
space, is accessed through the DataRam/Eeprom
Banking Register:
Bit 0 if set selects the first EEPROM bank
Bit 1 if set selects the second EEPROM bank
Bit 3 if set selects the first RAM bank
Bit 4 if set selects the second RAM bank.
Care must be taken that only one of these four bit
must be set at a time, for more details see Data
Sheet of the corresponding ROM device.
4.5.3 Timer 1, Timer 2, SPI, Watchdog
Clock of these devices are voluntarily validated
only during emulation, it provides to see the evolving values of them. Therefore pay attention that in
Step by Step mode the values of counters can be
slightly different of a real time session because of
setting ON and OFF emulation.
For using these peripherals, please, refer to data
sheet of the corresponding ROM DEVICE.
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ST624xB-EMU2 - DEDICATION BOARD (DBE)
4.5.4 Analog to Digital Converter
This peripheral is available on A port and Bit 0 to3
of B port. The ADC input can be connected at one
of the 12 inputs, the 8 of port A and the 4 of port B,
by properly programming the registers of these
ports (one at a time).
If more than one ADC input are selected, they will
be short circuited each other’s. Thisfeature can be
eventually used for multiplexing analog signals.
The analog to Digital Converter converts the input
value in about 70µS at 8 MHz of Xtal clock. Clock
conversion is always present, it means that a data
conversion is always accomplished after writing a
start conversion even if it is executed in Stepmode
of emulation. It allows to the user to convert analog
input step by step.
Note on ADC voltage reference:
The high voltage reference for the ADC is the ap-
plied voltage on the pin VCC internally buffered in
the board.
The low voltage reference is the GROUND.
Then to have a conversion result of 0FFH, the volt-
age at the analog input must be equal to the voltage of the VCC pin.
4.5.5 Port A
The functioning mode of each bit of this 8 bits port
is selected by properly programming the three associated registers: Data Register (DRA), Data Direction Register (DDRA), and Option Register
(ORA) as follow.
DDR OPR DR I/O Mode
001
0 1 0 Input with pullup, interrupt enabled
0 0 0 Input with pullup, interrupt disabled
0 1 1 Analog Input
1 1 X Push Pull Output
1 0 X Open Drain NMOS output
Input without pullup, interrupt disa-
bled
Beware of mixing input and output modes in the
same port, in this case, donot use SET or RES instructions on Data Registers:
When a port bit is in input mode, the data read is
the state of the pin of the device (or the probe);
when a port bit is in output mode the data read is
the data register, so when using a read/modify/
write instruction, a bit port mode can be changed
from input mode to analog input mode unintentionally!
For more details about this peripheral, please, refer to Data Sheet of the corresponding ROM Device.
4.5.6 Port B
The functioning mode of each bit of this 8bits port
is selected by properly programming the
three associated registers: Data Register (DRB),
Data Direction Register (DDRB), and Option
Register (ORB) as follow.
Note that only the four bits PB0 to PB3 can be
ADC inputs.
DDR OPR DR I/O Mode
0X 1
0 1 0 Input with pullup, interrupt enabled
0 0 0 Input withpullup, interrupt disabled
0 1 1 Analog Input (only for PB0 to 3)
1 1 X Push Pull Output
1 0 X Open Drain NMOS output
Input with out pullup, interrupt dis-
abled (PB4to7)
Beware of mixing input and output modes in the
same port, in this case do not use SET or RES instructions on Data Registers:
When a port bit is in input mode, the data read is
the state of the pin of the device (or the probe);
when a port bit is in output mode the data read is
the data register, so when using a read/modify/
write instruction, a bit port mode can be changed
from input mode to analog input mode unintentionally!.
For more details about this peripheral, please, refer to Data Sheet of the corresponding ROM Device.
4.5.7 Port C: combiports.
The functioning mode of each bit of this 8bits port
is selected by properly programming the
three associated registers: Data Register (DRB),
Data Direction Register (DDRB), and Option
Register (ORB) as follow.
Note: The alternate function on the 8 Input/Output
of this port are 8 segments output (S33 to
S40) of the Liquid Crystal Display driver. For
ST624X compatibility (combiport more), OPR and
DR are set to 1 after Reset,same as inthe device.
DDR OPR DR I/O Mode
001
0 1 0 Input with pullup, interrupt enabled
0 0 0 Input with pullup, interrupt disabled
0 1 1 Output S33 to S40 of LCD Driver
1 1 X Push Pull Output
1 0 X Open Drain NMOS output
Input without pullup, interrupt disa-
bled
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ST624xB-EMU2 - DEDICATION BOARD (DBE)
Beware of mixing input and output modes in the
same port, in this case do not use SET or RES instructions on Data Registers:
When a port bit is in input mode, the data read is
the state of the pin of the device (or the probe);
when a port bit is in output mode the data read is
the data register, so when using a read/modify/
write instruction, a bit port mode can be changed
from input mode to analog input mode unintentionally!.
For more details about this peripheral, please, refer to Data Sheet of the corresponding ROM Device.
4.5.8 32 Khz Oscillator
It is mandatory to use this peripheral in real time
mode with the development tool, because its
clock input is always available even in STEP
mode.
For more details about this peripheral, please, refer to Data Sheet of the corresponding ROM
Device.
4.5.9 LCD DRIVER
The LCD driver is directly emulated with a ST6240
microcomputer.
The ST6240 reads permanently the LCD RAM and
writes in its own corresponding RAM.
For more details about this peripheral, please, refer to Data Sheet of the corresponding ROM Device.
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5 TROUBLESHOOTING
ST624xB-EMU2 - TROUBLESHOOTING
5.1 AT POWER UP
At the beginning of an emulation session, on
screen of PC mustappear the debugger message
up to the end of software connection establishment.
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 serialline isnot connected theright I/Oport
of the computer.
5.2 DURING EMULATION: PROBLEM WITH
PROGRAM COUNTER
In case of ”Check Hardware Jumpering” or wrongly executing code in step mode:
Most of the time, this problem occurs with HDS1
emulator or with HDS2 plastic BOX up to 4.3 version, 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 on pin Reset
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 sessioneven if application is
off, it is required particularly in MONITOR or TV
applications.
With old ST6 HDS1emulator, 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 theapplication (which is off), at
this time the ST6 emulator is in reset state, because Reset and VCC pins are at low level.
– Power ON the application, then theexecution of
software will start.
5.4 DISCREPANCIES BETWEEN EMULATOR
AND ROM OR EPROM DEVICE
When somedifferences 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 theCPU,
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 abit port in output, the read value is
the value of the corresponding bit in theData Register.
In case of problems check if each used register is
correctly accessed. The principle ST6 registers
(depending on the family), withwhichcare 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
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ST624xB-EMU2 - TROUBLESHOOTING
– The Data RAM/EEPROM Banking Register
– The Data ROM window Register
To offer more flexibility to the user, all of these reg-
isters are readable outside of real time.(undefined
bits are read as ”0” value).
5.5 AVOID THE MOST FREQUENT PROBLEMS
WHEN PROGRAMMING ST6 MICROS!
5.5.1 Execution of Interrupt
If interrupt are not executed, in most cases, it
comes from:
– The core is not in normal mode: after RESET the
core is inNMI mode, to enter the normal mode
which let execute interrupt, the core must exe-
cute a RETI instruction.
– The global enable interrupt bit has notbeen SET,
or has been unintentionally cleared, then theIOR
register must be checked. The default value to
enable Interrupts is 010H.
– The enable interrupt bit of the desired peripheral
has not been SET, or has been unintentionally
cleared.
– The Interrupt Option Register is write only, and
has been wrongly written by a read/modify/write
instruction, only LDI is permitted.
5.5.2 Execution of WAIT and STOP instructions
In WAITmode, led WAIT is ON,in STOPmode the
2 led WAIT and STOP are ON(on the front panel
of the emulator).
If STOP or WAIT instructions are not exited, it
comes from:
– The core is notin normal mode: afterRESET the
core is in NMI mode, to enter the normal mode
which let execute interrupt to exit from these
states,the core must execute a RETI instruction.
Explanation: the only way to go out of STOP or
WAIT state is to have an INTERRUPT or a RESET, itis the reason why, to execute these instructions the interrupt must have been validated.
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Notes:
ST624xB-EMU2 - TROUBLESHOOTING
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by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics productsare not
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