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參數(shù)資料
| 型號： | 4250 |
| 英文描述： | Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23 |
| 中文描述： | 4250組數(shù)據(jù)表數(shù)據(jù)表652K/NOV.30.97 |
| 文件頁數(shù)： | 30/59頁 |
| 文件大小： | 652K |
| 代理商： | 4250 |
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29
MITSUBISHI MICROCOMPUTERS
4250 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
Fig. 27 Clock control circuit structure
Clock signal f(X
IN
) is obtained by connecting X
IN
pin and X
OUT
pin directly, and externally connecting a resistor to X
IN
and a
capacitor to X
OUT
. Connect this external circuit to pins X
IN
and
X
OUT
at the shortest distance.
When an external clock signal is input, note the input waveform
(refer to the list of precaution).
ROM ORDERING METHOD
Please submit the information described below when ordering
Mask ROM.
(1) M34250M2-XXXFP Mask ROM Order Confirmation Form
..............................................................................................1
(2) Data to be written into mask ROM ......................... EPROM
(three sets containing the identical data)
(3) Mark Specification Form.....................................................1
Fig. 28 Resistor and capacitor external circuit
CLOCK CONTROL
The clock control circuit consists of the following circuits.
System clock generating circuit
Control circuit to stop the clock oscillation
Control circuit to return from the RAM back-up state
Internal clock
generating circuit
(divided by 4)
Instruction clock
RESET
Key-on wakeup control register
K0
0
, K0
1
G
0
/INT pin
K0
2
0
1
Ports G
1
–G
3
Ports S
0
–S
3
Counter
Wait time control
circuit
(Note)
Software
start signal
Note: The wait time control circuit is used to start the microcomputer operation after 3584 to 3585 machine cycles
for the time required to stabilize the f(X
IN
) oscillation.
Oscillation
circuit
R
S
Q
POF instruction
X
IN
X
OUT
Multiplexer
Rising
Falling
Rising detected
M
X
IN
X
OUT
The system clock frequency
is affected by a capacitor, a
resistor and an LSI, So, set
the constants within the
range of the frequency limits.
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