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参数资料
| 型号： | M38207M8-XXXHP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 0.50 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 63/69页 |
| 文件大小： | 944K |
| 代理商： | M38207M8-XXXHP |
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Rev.4.01
Nov 14, 2003
page 66 of 136
3803/3804 Group
A-D CONVERTER
[A-D Conversion Register 1, 2 (AD1, AD2)]
003516, 003816
The A-D conversion register is a read-only register that stores the
result of an A-D conversion. When reading this register during an
A-D conversion, the previous conversion result is read.
Bit 7 of the A-D conversion register 2 is the conversion mode se-
lection bit. When this bit is set to “0,” the A-D converter becomes
the 10-bit A-D mode. When this bit is set to “1,” that becomes the
8-bit A-D mode. The conversion result of the 8-bit A-D mode is
stored in the A-D conversion register 1. As for 10-bit A-D mode,
not only 10-bit reading but also only high-order 8-bit reading of
conversion result can be performed by selecting the reading pro-
cedure of the A-D conversion registers 1, 2 after A-D conversion is
completed (in Figure 58).
As for 10-bit A-D mode, the 8-bit reading inclined to MSB is per-
formed when reading the A-D converter register 1 after A-D
conversion is started; and when the A-D converter register 1 is
read after reading the A-D converter register 2, the 8-bit reading
inclined to LSB is performed.
[AD/DA Control Register (ADCON)] 003416
The AD/DA control register controls the A-D conversion process.
Bits 0 to 2 and bit 4 select a specific analog input pin. Bit 3 signals
the completion of an A-D conversion. The value of this bit remains
at “0” during an A-D conversion, and changes to “1” when an A-D
conversion ends. Writing “0” to this bit starts the A-D conversion.
Comparison Voltage Generator
The comparison voltage generator divides the voltage between
VREF and AVSS into 1024, and that outputs the comparison voltage
in the 10-bit A-D mode (256 division in 8-bit A-D mode).
The A-D converter successively compares the comparison voltage
Vref in each mode, dividing the VREF voltage (see below), with the
input voltage.
10-bit A-D mode (10-bit reading)
Vref =
n (n = 0–1023)
10-bit A-D mode (8-bit reading)
Vref =
n (n = 0–255)
8-bit A-D mode
Vref =
(n–0.5) (n = 1–255)
=0
(n = 0)
Fig. 57 Structure of AD/DA control register
Channel Selector
The channel selector selects one of ports P67/AN7 to P60/AN0 or
P07/AN15 to P00/AN8, 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 then stores the result in the
A-D conversion registers 1, 2. When an A-D conversion is com-
pleted, the control circuit sets the AD conversion completion bit
and the AD interrupt request bit to “1”.
Note that because the comparator consists of a capacitor cou-
pling, set f(XIN) to 500 kHz or more during an A-D conversion.
VREF
256
VREF
256
Fig. 58 Structure of 10-bit A-D mode reading
VREF
1024
AD/DA control register
(ADCON : address 003416)
Analog input pin selection bits 1
0 0 0: P60/AN0 or P00/AN8
0 0 1: P61/AN1 or P01/AN9
0 1 0: P62/AN2 or P02/AN10
0 1 1: P63/AN3 or P03/AN11
1 0 0: P64/AN4 or P04/AN12
1 0 1: P65/AN5 or P05/AN13
1 1 0: P66/AN6 or P06/AN14
1 1 1: P67/AN7 or P07/AN15
AD conversion completion bit
0: Conversion in progress
1: Conversion completed
Analog input pin selection bit 2
0: AN0 to AN7 side
1: AN8 to AN15 side
Not used (returns “0” when read)
DA1 output enable bit
0: DA1 output disabled
1: DA1 output enabled
DA2 output enable bit
0: DA2 output disabled
1: DA2 output enabled
b7
b0
b2 b1 b0
10-bit reading
(Read address 003816 before 003516)
A-D conversion register 2
(AD2: address 003816)
A-D conversion register 1
(AD1: address 003516)
8-bit reading
(Read only address 003516)
A-D conversion register 1
(AD1: address 003516)
Note : Bits 2 to 6 of address 003816 become “0”
at reading.
b8
b7 b6 b5 b4 b3 b2 b1 b0
b7
b0
b9
b7
b0
b9 b8 b7 b6b5b4 b3 b2
b7
b0
0
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