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M38220E1-FP Datasheet

  • M38220E1-FP

  • SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

  • 980.52KB

  • 78页

  • MITSUBISHI   MITSUBISHI

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MITSUBISHI MICROCOMPUTERS
3822 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
A-D CONVERTER
[A-D Conversion Register (AD)] 0035
16
The A-D conversion register is a read-only register that contains
the result of an A-D conversion. When reading this register during
an A-D conversion, the previous conversion result is read.
b7
b0
A-D control register
(ADCON : address 0034
16
)
Analog input pin selection bits
0 0 0 : P6
0
/AN
0
0 0 1 : P6
1
/AN
1
0 1 0 : P6
2
/AN
2
0 1 1 : P6
3
/AN
3
1 0 0 : P6
4
/AN
4
1 0 1 : P6
5
/AN
5
1 1 0 : P6
6
/AN
6
1 1 1 : P6
7
/AN
7
AD conversion completion bit
0 : Conversion in progress
1 : Conversion completed
V
REF
input switch bit
0 : OFF
1 : ON
AD external trigger valid bit
0 : A-D external trigger invalid
1 : A-D external trigger valid
Interrupt source selection bit
0 : Interrupt request at A-D
conversion completed
1 : Interrupt request at ADT
input falling
Not used (returns 鈥?鈥?when read)
[A-D Control Register (ADCON)] 0034
16
The A-D control register controls the A-D conversion process. Bits
0 to 2 of this register select specific analog input pins. Bit 3 signals
the completion of an A-D conversion. The value of this bit remains
at 鈥?鈥?during an A-D conversion, then changes to 鈥?鈥?when the A-
D conversion is completed. Writing 鈥?鈥?to this bit starts the A-D
conversion. Bit 4 controls the transistor which breaks the through
current of the resistor ladder. When bit 5, which is the AD external
trigger valid bit, is set to 鈥?鈥? this bit enables A-D conversion even
by a falling edge of an ADT input. Set ports which share with ADT
pins to input when using an A-D external trigger.
[Comparison Voltage Generator]
The comparison voltage generator divides the voltage between
AV
SS
and V
REF
by 256, and outputs the divided voltages.
[Channel Selector]
The channel selector selects one of the input ports P6
7
/AN
7
鈥揚6
0
/
AN
0,
and inputs it to the comparator.
Fig. 30 Structure of A-D control register
[Comparator and Control Circuit]
The comparator and control circuit compares an analog input volt-
age with the comparison voltage and stores the result in the A-D
conversion register. When an A-D conversion is completed, the
control circuit sets the AD conversion completion bit and the AD
interrupt request bit to 鈥?鈥?
Note that the comparator is constructed linked to a capacitor, so
set f(X
IN
) to at least 500 kHz during A-D conversion.
Use the clock divided from the main clock X
IN
as the internal clock
蠁.
Data bus
b7
A-D control register
P5
7
/ADT
3
b0
P6
0
/AN
0
P6
1
/AN
1
P6
2
/AN
2
P6
3
/AN
3
P6
4
/AN
4
P6
5
/AN
5
P6
6
/AN
6
P6
7
/AN
7
Channel selector
Comparator
A-D control circuit
ADT/A-D interrupt request
A-D conversion
register
8
Resistor ladder
AV
SS
V
REF
Fig. 31 A-D converter block diagram
33

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