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參數(shù)資料
| 型號： | M37906M8C-XXXFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDSO42 |
| 封裝： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42 |
| 文件頁數(shù)： | 61/101頁 |
| 文件大小： | 766K |
| 代理商： | M37906M8C-XXXFP |
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62
M37906M4C-XXXFP, M37906M4C-XXXSP, M37906M4H-XXXFP
M37906M4H-XXXSP, M37906M6C-XXXFP, M37906M6C-XXXSP
M37906M8C-XXXFP, M37906M8C-XXXSP
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
param
etric
lim
its are
subject
to change.
16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Figure 68 shows the bit configuration of comparator function select
register 0 (address DC16). Bits 7 to 0 correspond to channels 7 to 0
respectively. Each channel can be selected as either an A-D con-
verter or a comparator. When the bit is “0”, the channel correspond-
ing to it functions as a 10-bit or an 8-bit A-D converter. When the bit
is “1”, the channel functions as a comparator.
When selecting an A-D converter, an input voltage to a selected ana-
log input pin is A-D converted and the result is stored into the A-D
register.
When selecting a comparator, D-A conversion is performed to the
value of which high-order 8 bits are the value stored in an even ad-
dress of the A-D converter and of which low-order 2 bits are “102.”
Then, this D-A converted value is compared with the voltage sup-
plied to an analog input pin. After the comparison, when the voltage
supplied to an analog input pin is higher, “1” is stored into the com-
parator result register 0 (address DE16) shown in Figure 69. When it
is lower, “0” is stored into that register.
Be sure to perform only read to the A-D register of which channel is
selected as an A-D converter, and perform only write to the A-D reg-
ister of which channel is selected as a comparator. Additionally, do
not write to the comparator function select register 0 and the A-D reg-
ister while an A-D converter or a comparator is operating.
Port direction register’s bits corresponding to pins to be A-D con-
verted must be “0” (input mode) because analog input ports are mul-
tiplexed with port P7.
Figure 70 shows the bit configuration of the A-D control register 0
(address 1E16), and Figure 71 shows that of the A-D control register
1 (address 1F16).
The operation clock of the A-D converter,
φAD, is selected by the fol-
lowing bits: bit 7 of the A-D control register 0 and bit 4 of the A-D con-
trol register 1.
When bit 4 of the A-D control register 1 = “0”,
φAD is selected as fol-
lows:
if bit 7 of the A-D control register 0 = “0”,
φAD = f2/4.
if bit 7 of the A-D control register 0 = “1”,
φAD = f2/2.
When bit 4 of the A-D control register 1 = “1”,
φAD is selected as fol-
lows:
if bit 7 of the A-D control register 0 = “0”,
φAD = f2.
if bit 7 of the A-D control register 0 = “1”,
φAD = f1.
Note that the highest frequency,
φAD = f1, can be selected only in the
8-bit resolution mode.
φAD during A-D conversion must be 250 kHz or more because the
comparator uses a capacity coupling amplifier.
Bit 3 of A-D control register 1 is used to select whether to regard the
conversion result as 10-bit or as 8-bit data. The conversion result is
regarded as 10-bit data when bit 3 is “1” and as 8-bit data when bit 3
is “0”.
When the conversion result is used as 10-bit data, the low-order 8
bits of the conversion result is stored in the even address of the cor-
responding A-D register and the high-order 2 bits are stored in bits 0
and 1 at the odd address of the corresponding A-D register. Bits 2 to
7 of the A-D register odd address are “0000002” when read.
When the conversion result is used as 8-bit data, the high-order 8
bits of the 10-bit A-D conversion result are stored in even address of
the corresponding A-D register. In this case, the value at the A-D
register’s odd address is “0016” when read.
Whether to connect the reference voltage input (VREF) with the lad-
Fig. 68 Bit configuration of comparator function select register 0
Fig. 69 Bit configuration of comparator result register 0
der network or not depends on bit 5 of the A-D control register 1. The
VREF pin is connected when bit 5 is “0” and is disconnected when bit
5 is “1” (High impedance state).
When A-D or D-A conversion is not performed, current from the VREF
pin to the ladder network can be cut off by disconnecting ladder net-
work from the VREF pin.
Before starting A-D or D-A conversion, wait for 1
s or more after
clearing bit 5 to “0”.
76543210
Comparator function select register 0
“0” : A-D converter is selected.
“1” : Comparator is selected.
AN0 pin comparator function select bit
AN1 pin comparator function select bit
AN2 pin comparator function select bit
AN3 pin comparator function select bit
AN4 pin comparator function select bit
Fix these bits to “000”.
Address
DC16
000
76543210
Comparator result register 0
“0” : ANi input level is lower than set digital value
“1” : ANi input level is higher than set digital value
AN0 pin comparator result bit
AN1 pin comparator result bit
AN2 pin comparator result bit
AN3 pin comparator result bit
AN4 pin comparator result bit
Address
DE16
Note: Do not access with the ORAM(ORAMB) or ANDM(ANDMB) instruction.
相關(guān)PDF資料 |
PDF描述 |
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| M37906M4C-XXXSP | 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP42 |
| M37906M4H-XXXSP | 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PDIP42 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37906M8C-XXXSP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:16-BIT CMOS MICROCOMPUTER |
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| M37920FCCHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
| M37920FGCGP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION |
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