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參數(shù)資料
| 型號(hào)： | M37733MHB |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Single Chip 16 Bits CMOS Microcomputer(16位單片機(jī)) |
| 中文描述： | 單片微機(jī)16位的CMOS（16位單片機(jī)） |
| 文件頁數(shù)： | 42/89頁 |
| 文件大?。?/td> | 1992K |
| 代理商： | M37733MHB |
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42
MITSUBISHI MICROCOMPUTERS
M37733MHBXXXFP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
(1) One-shot mode
One-shot mode is selected when bits 3 and 4 of A-D control register
0 are “0”. The analog input pin (AN
0
– AN
7
) is selected with bits 0 to
2 of A-D control register 0. A-D conversion can be started by a software
trigger or by an external trigger.
A software trigger is selected when bit 5 of A-D control register 0 is
“0” and an external trigger is selected when it is “1”. When a software
trigger is selected, A-D conversion is started when bit 6 (A-D
conversion start flag) is set to “1”. A-D conversion ends after 59
φ
AD
cycles and an interrupt request bit of the A-D conversion interrupt
control register is set to “1”. At the same time, the A-D conversion
start flag (bit 6 of the A-D control register 0) is cleared and A-D
conversion stops. The result of A-D conversion is stored in the A-D
register corresponding to the selected pin.
If an external trigger is selected, A-D conversion starts when the A-D
conversion start flag is “1” and the
AD
TRG
input changes from “H” to
“L”. In this case, the pins that can be used for A-D conversion are
AN
0
to AN
4
, AN
6
and AN
7
(a total of 7) because the
AD
TRG
pin is also
used as the analog voltage input pin (AN
5
). The operation is the same
as with software trigger except that the A-D conversion start flag is
not cleared after A-D conversion and a retrigger can be available
during A-D conversion.
(2) Repeat mode
Repeat mode is selected when bit 3 of A-D control register 0 is “1”
and bit 4 is “0”. The operation of this mode is the same as the operation
of one-shot mode except that when A-D conversion of the selected
pin is complete and the result is stored in the A-D register, conversion
does not stop, but is repeated.
No interrupt request is issued in this mode. Furthermore, if software
trigger is selected, the A-D conversion start flag is not cleared.
The contents of the A-D register can be read at any time.
Fig. 50 A-D control register bit configuration
7
6
5
4
3
2
0
1
0
Address
1F
16
A-D control register 1
A-D sweep pin selection bits
0 0 : AN
0
, AN
1
(2 pins)
0 1 : AN
0
– AN
3
(4 pins)
1 0 : AN
0
– AN
5
(6 pins)
1 1 : AN
0
– AN
7
(8 pins)
0 : Always “0”
V
REF
connection selection bit
0 : V
REF
is connected
1 : V
REF
is not connected
Analog input selection bits
0 0 0 : Select AN
0
0 0 1 : Select AN
1
0 1 0 : Select AN
2
0 1 1 : Select AN
3
1 0 0 : Select AN
4
1 0 1 : Select AN
5
1 1 0 : Select AN
6
1 1 1 : Select AN
7
A-D operation mode selection bits
0 0 : One-shot mode
0 1 : Repeat mode
1 0 : Single sweep mode
1 1 : Repeat sweep mode
7
6
5
4
3
2
0
1
A-D control register 0
Trigger selection bit
0 : Software trigger
1 :
AD
TRG
input trigger
A-D conversion start flag
0 : Stop A-D conversion
1 : Start A-D conversion
A-D conversion frequency (
φ
AD
) selection flag
0 : Select f
2
/4
1 : Select f
2
/2
1E
16
Address
8/10-bit mode selection bit
0 : 8-bit mode
1 : 10-bit mode
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