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| 型號(hào)： | M44C510D-XXX-DOW |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, MICROCONTROLLER |
| 封裝： | SSOP-44 |
| 文件頁數(shù)： | 43/60頁 |
| 文件大?。?/td> | 709K |
| 代理商： | M44C510D-XXX-DOW |
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M44C510E
Rev. A1, 04-May-00
Preliminary Information
48 (60)
2.7
Emulation
CORE
Target Chip
EVC
EPROM
CORE
TCL
Clock
TCL
Reset
NRST
Mode
TE
NRST
TCL
Data
A ddress
I/O–Controlbus
I/O–Bus
Application
Port
1
Port
0
96 11552
Port 1
Port 0
NRST
Figure 45. Emulation
All MARC4 controllers have a special emulation mode.
It is activated by setting the TE pin to logic HIGH level
after reset. In this mode, the internal CPU core is inactive
and the I/O bus is available via port 0 and port 1 to allow
the emulator the access to the on-chip peripherals. The
emulator contains a special emulation CPU with a
MARC4 core and additional breakpoint logic and takes
over the core function. The basic function of the emulator
is to evaluate the customer’s program and hardware in
real time.
2.8
MTP Support
The T48C510 from TEMIC Semiconductors provides
full pin compatible multi time programmable (MTP) sup-
port for the M44C510E. This device is equipped with
EEPROM memory and allows in-system testing and real-
time execution of up to 4 KByte application programs
along with non volatile configuration of the M44C510E
mask option settings.
For further details please refer to the T48C510 data sheet.
2.9
Noise Considerations
When designing the microcontroller based application,
several factors should be taken into consideration to
increase noise immunity and reduce electromagnetic
emission (EME). Many such potential problems can be
avoided by careful layout of the printed circuit board
(PCB). The PCB contains many parasitic components
which at first sight are not apparent. PCB tracks can act
as antennas or as coupling capacitors. Long stretches of
parallel tracks and long high frequency signal lines
should thus be avoided wherever possible to minimise the
chance of picking up or transmitting unwanted signals.
2.9.1
Noise Immunity
The following guidelines will increase system noise im-
munity:
D Unconnected inputs should not be left open. If port
pins are not required then it is recommended to set
pullup or pulldown option on these pins.
D Special care should be taken when laying out the PCB
that interrupt, reset and clock signal lines are kept
short and are carefully shielded or have sufficient
spacing from other on board noise generating sources.
D A quartz crystal should always be directly located
immediately next to the microcontroller crystal
oscillator terminals (OSCIN and OSCOUT), the
connections being always very short. This avoids not
only signal coupling onto the clock source but can also
reduces EME.
D PCB’s should where economically possible be
equipped with adequate ground planes.
D The microcontroller power supply should be
decoupled with an electrolytic capacitance (approx.
10
mF) in parallel with a ceramic capacitance
(approx.100 nF) situated as close to the micro-
controller device as possible.
2.9.2
Electromagnetic Emission
Electromagnetic emmision is caused by rapidly changing
electrical current (dI/dt) in long antenna like connection
lines and cables. This can result in electrical interference
on other telecommunication devices. These current
spikes are more often than not present in the system power
supply lines and driver signal lines.
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