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參數(shù)資料
| 型號： | M34512M2 |
| 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(jī)的CMOS |
| 文件頁數(shù)： | 47/80頁 |
| 文件大?。?/td> | 760K |
| 代理商： | M34512M2 |
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47
4512 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
A-D converter-1
When the operating mode of the A-D converter is changed from
the comparator mode to the A-D conversion mode with the bit 3
of register Q2 in a program, be careful about the following notes.
Clear the bit 2 of register V2 to “0” to change the operating mode
of the A-D converter from the comparator mode to the A-D con-
version mode with the bit 3 of register Q2 (refer to Figure 42
).
The A-D conversion completion flag (ADF) may be set when the
operating mode of the A-D converter is changed from the com-
parator mode to the A-D conversion mode. Accordingly, set a
value to register Q2, and execute the SNZAD instruction to clear
the ADF flag.
Do not change the operating mode (both A-D conversion mode
and comparator mode) of A-D converter with the bit 3 of register
Q2 during operating the A-D converter.
.
.
LA
TV2A
LA
TQ2A
8
; (
0
2
)
; The SNZAD instruction is valid........
; (0
2
)
; Change of the operating mode of the A-D
converter from the comparator mode to the
A-D conversion mode
0
SNZAD
NOP
.
.
Fig. 43 Analog input external circuit example-1
Fig. 44 Analog input external circuit example-2
POF instruction
Execute the POF instruction immediately after executing the
EPOF instruction to enter the RAM back-up.
Note that system cannot enter the RAM back-up state when ex-
ecuting only the POF instruction.
Be sure to disable interrupts by executing the DI instruction be-
fore executing the EPOF instruction.
TALA instruction
When the TALA instruction is executed, the low-order 2 bits of
register AD is transferred to the high-order 2 bits of register A, si-
multaneously, the low-order 2 bits of register A is “0.”
Program counter
Make sure that the PC
H
does not specify after the last page of
the built-in ROM.
N.F pin
This pin has no function, and connect to V
SS
as an unused pin.
A-D converter-2
Each analog input pin is equipped with a capacitor which is used
to compare the analog voltage. Accordingly, when the analog
voltage is input from the circuit with high-impedance and, charge/
discharge noise is generated and the sufficient A-D accuracy
may not be obtained. Therefore, reduce the impedance or, con-
nect a capacitor (0.01
μ
F to 1
μ
F) to analog input pins (Figure
43).
When the overvoltage applied to the A-D conversion circuit may
occur, connect an external circuit in order to keep the voltage
within the rated range as shown the Figure 44. In addition, test
the application products sufficiently.
: this bit is not related to the change of the
operating mode of the A-D conversion.
Fig. 42 A-D converter operating mode program example
11
12
13
14
Sensor
A
IN
Apply the voltage withiin the specifications
to an analog input pin.
Sensor
A
IN
About 1k
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| M34512M2-XXXFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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