參數(shù)資料
型號(hào)： M37736MHBXXXGP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述： 單片16位CMOS微機(jī)
文件頁數(shù)： 43/96頁
文件大?。?/td> 1328K
代理商： M37736MHBXXXGP
43
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
MITSUBISHI MICROCOMPUTERS
M37736MHBXXXGP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
(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 pins are selected by bits 1 and
0 of the A-D control register 1 (address 1F
16
). Two pins, four pins, six
pins or eight pins can be selected 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
performed 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
external trigger input. A software trigger is selected when bit 5 is “0”
and an external trigger is selected when it is “1”.
When a software trigger is selected, A-D conversion is started when
A-D control register 0 bit 6 (A-D conversion start flag) is set to “1”.
When A-D conversion of all selected pins ends, an interrupt request
bit of the A-D conversion interrupt control register is set to “1”. At the
same time, A-D conversion start flag is cleared and A-D conversion
stops.
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 A-D conversion result which is stored in the A-D
register 5 becomes invalid because the
AD
TRG
pin is also used as the
AN
5
pin.
The operation by external trigger is the same as that done by 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.
(4) Repeat sweep mode
Repeat sweep mode 0 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 converting from the AN
0
pin to the 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 software trigger is selected, the A-D conversion start flag is not
cleared. The A-D register can be read at any time.
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