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M34250M2 Datasheet(Fiches technique) 28 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
28
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
: Microcomputer starts its operation after 3584 to 3585 machine cycles for the time
required to stabilize the f(XIN) oscillation.
Stabilizing time a
POF instruction
is executed
A
f(XIN) oscillation
Return input
B
(RAM back-up
mode)
f(XIN) stop
Reset
(Stabilizing time a )
(Stabilizing time a )
K03
K02
K01
K00
Instruction clock divided by 4
Instruction clock divided by 512
Rising waveform (“L”
→ “H”)
Falling waveform (“H”
→ “L”)
Key-on wakeup not used
Key-on wakeup used (“L” level recognized)
Key-on wakeup not used
Key-on wakeup used (“L” level recognized)
Prescaler dividing ratio selection bit
Interrupt valid waveform for INT pin/
key-on wakeup valid waveform selection
bit (Note 2)
Ports G1–G3 key-on wakeup control bit
Ports S0–S3 key-on wakeup control bit
Key-on wakeup control register K0
at reset : 00002
at RAM back-up : state retained
0
1
0
1
0
1
0
1
R/W
Notes 1: “R” represents read enabled, and “W” represents write enabled.
2: Set a value to the bit 2 of register K0, and execute the SNZ0 instruction to clear the EXF0 flag after executing at least one
instruction. According to the input state of G0/INT pin, the external interrupt request flag (EXF0) may be set when the
interrupt valid waveform is changed.
Table 14 Key-on wakeup control register
Fig. 24 State transition
S
R
Q
Power down flag P
POF instruction
Reset input
q Set source
POF instruction is executed
q Clear source
Reset input
Fig. 25 Set source and clear source of the P flag
Fig. 26 Start condition identified example using the SNZP
instruction
Software start
P = “1”
?
Yes
Warm start
Cold start
No
(5) Key-on wakeup control register K0
Key-on wakeup control register K0
The interrupt valid waveform for INT pin/key-on wakeup
valid waveform selection bit, the ports G1–G3 key-on
wakeup control bit and the ports S0–S3 key-on wakeup
control bit are assigned to the register K0. Set the contents
of this register through register A with the TK0A instruction.
The TAK0 instruction can be used to transfer the contents
of register K0 to register A.




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