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參數(shù)資料
| 型號(hào)： | M37920FGCHP |
| 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(yè)數(shù)： | 69/158頁(yè) |
| 文件大?。?/td> | 1261K |
| 代理商： | M37920FGCHP |
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69
M37920FCCGP, M37920FCCHP
M37920FGCGP, M37920FGCHP
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER FLASH MEMORY VERSION
MITSUBISHI MICROCOMPUTERS
Operation mode
The operation mode is selected by bits 3 and 4 of A-D control regis-
ter 0. The available operation modes are one-shot, repeat, single
sweep, and repeat sweep. Analog input port pins are multiplexed
with port P7 pins. Therefore, bits which correspond to pins for A-D
conversion must be
“
0
”
(input mode).
(1) One-shot mode
One-shot mode is selected when bits 3 and 4 of A-D control register
0 are
“
0
”
is
“
0
”
. The A-D conversion pins are selected with bits 0 and
1 of A-D control register 0.
When a software trigger is selected, A-D conversion is started when
bit 6 (A-D conversion start bit) is set to
“
1
”
.
When bit 3 of the A-D control register 1 is
“
1
”
, A-D conversion ends
after 59
φ
AD
cycles, and the interrupt request bit of the A-D interrupt
control register is set to
“
1
”
. At the same time, bit 6 of A-D control reg-
ister 0 (A-D conversion start bit) is cleared to
“
0
”
and A-D conversion
stops. The result of A-D conversion is stored in the A-D register cor-
responding to the selected pin.
If an external trigger is selected, A-D conversion starts when the A-D
conversion start bit is
“
1
”
and a valid edge is input to the AD
TRG
pin,
This operation is the same as that for software trigger except that
the A-D conversion start bit 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 com-
plete and the result is stored in the A-D register, conversion does not
stop, but is repeated.
No interrupt request is generated in this mode. Furthermore, if a soft-
ware trigger is selected, the A-D conversion start bit is not cleared.
The contents of the A-D register can be read at any time.
(3) Single sweep mode
Single sweep mode is selected when bit 3 of A-D control register 0 is
“
0
”
and bit 4 is
“
1
”
.
In the single sweep mode, the number of analog input pins to be
swept can be selected. Analog input pin is selected by bit 0 of the A-
D control register 1 (address 1F
16
). Two pins, or four pins can be se-
lected as analog input pins, depending on the contents of these bits.
A-D conversion is performed only for selected input pins. After A-D
conversion is performed for input of AN
0
pin, the conversion result is
stored in A-D register 0, and in the same way, A-D conversion is per-
formed for selected pins one after another. After A-D conversion is
performed for all selected pins, the sweep is stopped.
A-D conversion can be started with a software trigger or with an ex-
ternal trigger input. A software trigger is selected when bit 5 of the A-
D control register 0 (address 1E
16
) 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 of A-D control register 0 (A-D conversion start bit) is set to
“
1
”
.
When A-D conversion of all selected pins end, the interrupt request
bit of the A-D conversion interrupt control register is set to
“
1
”
. At the
same time, A-D conversion start bit is cleared to
“
0
”
and A-D conver-
sion stops.
When an external trigger is selected, A-D conversion starts when the
A-D conversion start bit is
“
1
”
and a valid edge is input to the AD
TRG
pin. In this case, the A-D conversion result which is stored in the A-D
register 3 becomes invalid.
The operation by external trigger is the same as that by a software
trigger except that the A-D conversion start bit is not cleared to
“
0
”
after A-D conversion and that a retrigger can be available during A-D
conversion.
(4) Repeat sweep mode
Repeat sweep mode is selected when bit 3 of A-D control register 0
is
“
1
”
and bit 4 is
“
1
”
.
The difference from the single sweep mode is that A-D conversion
does not stop after conversion for all selected pins, but repeats again
from the AN
0
pin. The repeat is performed among the selected pins.
Also, no interrupt request is generated. Furthermore, if a software
trigger is selected, the A-D convension start bit is not cleared. The
A-D register can be read at any time.
Precautions for A-D conversion interrupt
function
Clear the interrupt request bit of the A-D interrupt control register (bit
3 at address 70
16
) before using an A-D interrupt. It is because this
interrupt request bit is undefined just after reset.
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