參數(shù)資料
型號(hào)： M34512M2
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁(yè)數(shù)： 35/80頁(yè)
文件大?。?/td> 760K
代理商： M34512M2
35
4512 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
PRELIMINARY
Notice: This is not a final specification.
change.
Some parametric limits are subject to
(9) Operation at comparator mode
The A-D converter is set to comparator mode by setting bit 3 of the
register Q2 to “1.”
Below, the operation at comparator mode is described.
(10) Comparator register
In comparator mode, the built-in DA comparator is connected to the
comparator register as a register for setting comparison voltages.
The contents of register B is stored in the high-order 4 bits of the
comparator register and the contents of register A is stored in the
low-order 4 bits of the comparator register with the TADAB instruc-
tion.
When changing from A-D conversion mode to comparator mode,
the result of A-D conversion (register AD) is undefined.
However, because the comparator register is separated from regis-
ter AD, the value is retained even when changing from comparator
mode to A-D conversion mode. Note that the comparator register
can be written and read at only comparator mode.
If the value in the comparator register is n, the logic value of com-
parison voltage V
ref
generated by the built-in DA converter can be
determined from the following formula:
(11) Comparison result store flag (ADF)
In comparator mode, the ADF flag, which shows completion of A-D
conversion, stores the results of comparing the analog input volt-
age with the comparison voltage. When the analog input voltage is
lower than the comparison voltage, the ADF flag is set to “1.” The
state of ADF flag can be examined with the skip instruction
(SNZAD). Use the interrupt control register V2 to select the inter-
rupt or the skip instruction.
The ADF flag is cleared to “0” when the interrupt occurs or when
the next instruction is skipped with the skip instruction.
(12) Comparator operation start instruction
(ADST instruction) (Figure 28)
In comparator mode, executing ADST starts the comparator oper-
ating.
The comparator stops 8 machine cycles after it has started (6
μ
s at
f(X
IN
) = 4.0 MHz in high-speed mode). When the analog input volt-
age is lower than the comparison voltage, the ADF flag is set to “1.”
(13) Notes for the use of A-D conversion 1
TALA instruction
When the TALA instruction is executed, the low-order 2 bits of
register AD is transferred to the high-order 2 bits of register A, si-
multaneously, the low-order 2 bits of register A is “0.”
(14) Notes for the use of A-D conversion 2
Do not change the operating mode (both A-D conversion mode and
comparator mode) of A-D converter with bit 3 of register Q2 while
A-D converter is operating.
When the operating mode of A-D converter is changed from the
comparator mode to A-D conversion mode with the bit 3 of register
Q2, note the following;
Clear bit 2 of register V2 to “0” to change the operating mode of
the A-D converter from the comparator mode to A-D conversion
mode with the bit 3 of register Q2.
The A-D conversion completion flag (ADF) may be set when the
operating mode of the A-D converter is changed from the com-
parator mode to the A-D conversion mode. Accordingly, set a
value to register Q2, and execute the SNZAD instruction to clear
the ADF flag.
Logic value of comparison voltage V
ref
V
ref
=
n
n: The value of register AD (n = 0 to 255)
Fig. 28 Comparator operation timing chart
V
DD
256
ADST instruction
Comparison result
store flag(ADF)
8 machine cycles
DAC operation signal
Comparator operation completed.
(The value of ADF is determined)
→
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M34513M2 Hook-Up Wire; Conductor Size AWG:26; No. Strands x Strand Size:7 x 34; Jacket Color:White; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes
M34513M2-420FP Hook-Up Wire; Conductor Size AWG:26; No. Strands x Strand Size:7 x 34; Jacket Color:Black; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes
M34513M4 Hook-Up Wire; Conductor Size AWG:26; No. Strands x Strand Size:7 x 34; Jacket Color:Dark Blue; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper RoHS Compliant: Yes
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