參數(shù)資料
型號(hào)： M37540E8GP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO36
封裝： 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-36
文件頁(yè)數(shù)： 35/88頁(yè)
文件大?。?/td> 872K
代理商： M37540E8GP
7540 Group
Rev.4.00
Jun 21, 2004
page 40 of 82
REJ03B0011-0400Z
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 1024, and outputs the divided voltages.
[Channel selector]
The channel selector selects one of ports P27/AN7 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.
s Note on A/D converter
As for AD translation accuracy, on the following operating condi-
tions, accuracy may become low.
(1) Since the analog circuit inside a microcomputer becomes sensi-
tive to noise when VREF voltage is set up lower than Vcc
voltage, accuracy may become low rather than the case where
VREF voltage and Vcc voltage are set up to the same value.
Fig. 38 Structure of A/D control register
Fig. 39 Structure of A/D conversion register
Fig. 40 Block diagram of A/D converter
A/D control register
(ADCON : address 003416, initial value: 1016)
Not used (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 : P26/AN6 (Note)
111 : P27/AN7 (Note)
Note: These can be used only for 36 pin version.
Read 8-bit (Read only address 003516)
b7
b0
b9
b8
b7
b6
b5
b4
b3
b2
(Address 003516)
Read 10-bit (read in order address 003616, 003516)
b7
b0
b9
b8
(Address 003616)
b7
b0
b7
b6
b5
b4
b3
b2
b1
b0
(Address 003516)
Note: High-order 6-bit of address 003616 returns “0” when read.
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
10
P20/AN0
P21/AN1
P22/AN2
P23/AN3
P24/AN4
P25/AN5
P26/AN6
P27/AN7
A/D conversion register (low-order)
(Address 003616)
(Address 003516)
A/D conversion register (high-order)
VSS
(2) When VREF voltage is lower than [3.0 V], the accuracy at the
low temperature may become extremely low compared with
that at room temperature When the system would be used at
low temperature, the use at VREF=3.0 V or more is recom-
mended.
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