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M34250M2 Datasheet(Fiches technique) 30 Page - Mitsubishi Electric Semiconductor

Numéro de pièce M34250M2
Description  SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER    
Télécharger  58 Pages
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Fabricant  MITSUBISHI [Mitsubishi Electric Semiconductor]
Site Internet  http://www.mitsubishichips.com
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 30 page
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MITSUBISHI
ELECTRIC
30
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
LA 4
; (!!!02)
TV1A
; The SNZ0 instruction is valid ............. Œ
LA 4
TK0A
; Change of the interrupt valid waveform
NOP
.............................................................. 
SNZ0
; The SNZ0 instruction is executed
NOP
...
Fig. 29 External interrupt program example
...
! : this bit is not related to the setting of G0/INT pin.
LIST OF PRECAUTIONS
ΠNoise and latch-up prevention
Connect a capacitor on the following condition to prevent noise
and latch-up;
connect a bypass capacitor (approx. 0.01
µF) between pins
VDD and VSS at the shortest distance,
equalize its wiring in width and length, and
use the thickest wire.
In the One Time PROM version, CNVSS pin is also used as
VPP pin. Connect this pin to VSS through the resistor about
5 k
Ω which is assigned to CNVSS/VPP pin as close as
possible at the shortest distance.
 Prescaler
Stop the prescaler operation to change its frequency dividing
ratio.
Ž Timer count source
Stop timer 1 counting to change its count source.
 Program counter
Make sure that the PCH does not specify after the last page of
the built-in ROM.
 G0/INT pin
When the interrupt valid waveform of the G0/INT pin is changed
with the bit 2 of register K0 in software, be careful about the
following notes.
After clear the bit 0 of register V1 to “0” (Figure 29Œ),
change the interrupt valid waveform of G0/INT pin with the
bit 2 of register K0 .
Set a value to bit 2 of register K0 and execute the SNZ0
instruction to clear the external interrupt request flag (EXF0)
after executing at least one instruction (refer to Figure 29).
Depending on the input state of the G0/INT pin, the EXF0
flag may be set when the interrupt valid waveform is
changed.
‘ Notes on unused pins
When pins G0/INT, G1/TOUT, G2 and G3 are connected to
VSS pin, turn off their pull-up transistors (register PU0=“!02”)
and also invalidate the key-on wakeup functions of pins
G1/TOUT, G2 and G3 (register K0=“!!0!2”) by software.
When the POF instruction is executed while these pins are
connected to VSS and the key-on wakeup functions are left
valid, the system returns from RAM back-up state by
recognizing the return condition immediately after going into
the RAM back-up state. When these pins are open, turn on
their pull-up transistors (register PU0=“!12”) by software.
When ports S0–S3 are connected to VSS pin, invalidate the
key-on wakeup functions (register K0=“!!!02”) by
software. When the POF instruction is executed while these
pins are connected to VSS and the key-on wakeup functions
are left valid, the system returns from RAM back-up state
by recognizing the return condition immediately after going
into the RAM back-up state.
When ports D2/C and D3/K are connected to VSS pin, turn
off their pull-up transistors (register PU0=“0!2”) by software.
When these pins are open, turn on their pull-up transistors
(register PU0=“1!2”) by software.
(Note when connecting to VSS and VDD)
• Connect the unused pins to VSS or VDD at the shortest distance
(within 20 mm) and use the thick wire against noise.
’ Multifunction
•G0/INT pin can be also used as an I/O port G0 even when it
is used as INT pin.
•G1/TOUT pin can be also used as input port G1 even when it
is used as TOUT pin.
•D2/C pin can be also used as I/O port D2 even when it is
used as port C.
•D3/K pin can be also used as I/O port D3 even when it is
used as port K.




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