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參數(shù)資料
| 型號： | M34282E2 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片4位微機的CMOS |
| 文件頁數(shù)： | 18/70頁 |
| 文件大?。?/td> | 560K |
| 代理商： | M34282E2 |
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MITSUBISHI
ELECTRIC
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
18
MITSUBISHI MICROCOMPUTERS
4282 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
(1) Internal state at reset
Table 6 shows port state at reset, and Figure 20 shows internal
state at reset (they are retained after system is released from
reset).
The contents of timers, registers, flags and RAM except shown
in Figure 20 are undefined, so set the initial value to them.
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1
1
1
1
0
0
Fig. 20 Internal state at reset
Table 6 Port state at reset
Name
D
0
–D
3
D
4
–D
7
G
0
–G
3
E
0
, E
1
CARR
“L” output
Note: The contents of all output latch is initialized to “0.”
State at reset
High impedance state
High impedance state (Pull-down transistor OFF)
High impedance state (Pull-down transistor OFF)
High impedance state (Pull-down transistor OFF)
VOLTAGE DROP DETECTION CIRCUIT
The built-in voltage drop detection circuit is designed to detect a
drop in voltage at operating and to reset the microcomputer if
the supply voltage drops below the specified value (Typ. 1.50 V)
or less.
Fig. 21 Voltage drop detection circuit operation waveform
The voltage drop detection circuit is stopped and power
dissipation is reduced in the RAM back-up mode with the
initialized CPU stopped.
Program counter (PC) ..............................................................
Address 0 in page 0 is set to program counter.
Power down flag (P).................................................................
Timer 1 underflow flag (T1F) ...................................................
Timer 2 underflow flag (T2F) ...................................................
Timer control register V1..........................................................
Timer control register V2..........................................................
Port CARR output flag (CAR) ..................................................
Pull-down control register PU0 ................................................
Pull-down control register PU1 ................................................
Logic operation selection register LO ......................................
Most significant ROM code reference enable flag (URS)
Carry flag (CY) .........................................................................
Register A.................................................................................
Register B.................................................................................
Register X.................................................................................
Register Y.................................................................................
Stack pointer (SP) ....................................................................
Microcomputer starts operation
after f(X
IN
) is counted to 16384 times.
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