參數(shù)資料
型號： M37210M3-010SP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
中文描述： 單芯片8位CMOS微機電壓合成與屏幕顯示控制器
文件頁數(shù)： 21/59頁
文件大?。?/td> 764K
代理商： M37210M3-010SP
MITSUBISHI MICROCOMPUTERS
M37210M3-XXXSP/FP, M37210M4-XXXSP, M37211M2-XXXSP
M37210E4-XXXSP/FP, M37210E4SP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
21
Fig. 18 A-D comparator block diagram
Fig. 17 Structure of A-D mode register
Fig. 16 Structure of A-D control register
Table 3. Relationship between the contents of A-D control register
and reference voltage
A-D control register
Bit 3
0
0
0
0
Reference voltage Vref
1/64 V
CC
3/64 V
CC
5/64 V
CC
27/64 V
CC
29/64 V
CC
31/64 V
CC
Bit4
0
0
0
1
1
1
1
1
1
Bit 2
0
0
1
1
1
Bit 1
0
0
1
0
1
1
Bit 0
0
1
0
1
0
1
…
…
…
…
…
…
7
0
A-D input pin selection bits
0 0 0 : A-D1
0 0 1 : A-D2
0 1 0 : A-D3
0 1 1 : A-D4
1 0 0 : A-D5
1 0 1 :
1 1 0 :
1 1 1 :
A-D mode regiser
(ADM : address 00EE
16
)
These are not
available
A-D mode register
Bits 0 to 2
P1
5
/A-D1
P1
6
/A-D2
P1
7
/A-D3
P3
5
/A-D4
P4
2
/A-D5
Analog
signal
switch
Comparator
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Switch tree
Resistor ladder
A-D control register
Data bus
Bit 5
Comparator control
7
0
D-A converter set bits
(refer to table 3)
A-D control register
(ADC : address 00EF
16
)
Strage bit of comparison result
0 : Input voltage <
reference voltage
1 : Input voltage >
reference voltage
A-D COMPARATOR
Block diagram of A-D comparator is shown in Figure 18. A-D com-
parator consists of 5-bit D-A converter and comparator. The A-D con-
trol register can generate 1/64 V
CC
-step internal analog voltage
based on the settings of bits 0 to 4.
Table 3 gives the relation between the descriptions of A-D control
register bits 0 to 4 and the generated internal analog voltage. The
comparison result of the analog input voltage and the internal analog
voltage is stored in the A-D control register, bit 5.
After selection of an analog input pin by bits 0-2 of A-D mode register
(address 00EE
16
), the digital value corresponding to the internal ana-
log voltage to be compared is then written in the A-D control register,
bit 0 to 3 and an analog input pin is selected. After 16 machine cycle,
the voltage comparison is completed.
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