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M34250M2 Datasheet(Fiches technique) 5 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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MITSUBISHI
ELECTRIC
5
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MULTIFUNCTION
Pin
G0
G1
D2
D3
Multifunction
INT
TOUT
C
K
Multifunction
G0
G1
D2
D3
Pin
INT (Note 2)
TOUT (Note 2)
C (Note 2)
K (Note 2)
Notes 1: Pins except above have just single function.
2: The I/O of ports D2, D3 and G0, and the input of port G1 can be used even when ports C and K and pins INT and TOUT are
selected.
CONNECTIONS OF UNUSED PINS
Pin
F0, F1
G0/INT, G1/TOUT
G2, G3
S0–S3
Connection
Connect to VSS pin.
Open or connect to VSS pin. (Note 3)
Pin
D0, D1
D2/C, D3/K
Connection
Connect to VSS pin.
Open or connect to VSS pin. (Note 1)
Connect to VSS pin. (Note 2)
Notes 1: When pins G0/INT, G1/TOUT, G2 and G3 are connected to VSS pin, turn off their pull-up transistors (Pull-up control register
PU0=“!02”) and also invalidate the key-on wakeup functions of pins G1/TOUT, G2 and G3 (Key-on wakeup contorl 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 (Pull-up control register
PU0=“!12”) by software.
2: When ports S0–S3 are connected to VSS pin, invalidate the key-on wakeup functions (Key-on wakeup contorl 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.
3: 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 and use the thick wire against noise.




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