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參數(shù)資料
| 型號： | MB90F949APF |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 20 MM, 3.35 MM HEIGHT, 0.65 MM PITCH, PLASTIC, QFP-100 |
| 文件頁數(shù)： | 22/57頁 |
| 文件大?。?/td> | 1586K |
| 代理商： | MB90F949APF |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7544 Group
MITSUBISHI MICROCOMPUTERS
29
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Som
e parametric
limits
are
subject
to change.
A-D Converter
The functional blocks of the A-D converter are described below.
[A-D conversion register] AD
The A-D conversion register is a read-only register that stores the
result of A-D conversion. Do not read out this register during an A-
D conversion.
[A-D control register] ADCON
The A-D control register controls the A-D converter. Bit 2 to 0 are
analog input pin selection bits. Bit 4 is the AD conversion comple-
tion bit. The value of this bit remains at “0” during A-D conversion,
and changes to “1” at completion of A-D conversion.
A-D conversion is started by setting this bit to “0”.
[Comparison voltage generator]
The comparison voltage generator divides the voltage between
AVSS and VREF by 256, and outputs the divided voltages.
[Channel selector]
The channel selector selects one of ports P25/AN5 to P20/AN0,
and inputs the voltage to the comparator.
[Comparator and control circuit]
The comparator and control circuit compares an analog input volt-
age with the comparison voltage and stores its result into the A-D
conversion register. When A-D conversion is completed, the con-
trol circuit sets the AD conversion completion bit and the AD
interrupt request bit to “1”. Because the comparator is constructed
linked to a capacitor, set f(XIN) to 500 kHz or more during A-D con-
version.
Fig. 31 Structure of A-D control register
Fig. 32 Block diagram of A-D converter
A-D control register
(ADCON : address 003416, initial value: 1016)
Disable (returns “0” when read)
AD conversion completion bit
0 : Conversion in progress
1 : Conversion completed
b7
b0
Analog input pin selection bits
000 : P20/AN0
001 : P21/AN1
010 : P22/AN2
011 : P23/AN3
100 : P24/AN4
101 : P25/AN5
110 : Disable
111 : Disable
A-D control register
(Address 003416)
Channel
selector
A-D control circuit
Resistor ladder
VREF
Comparator
A-D interrupt request
b7
b0
Data bus
3
8
P20/AN0
P21/AN1
P22/AN2
P23/AN3
P24/AN4
P25/AN5
(Address 003516)
A-D conversion register
VSS
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