參數(shù)資料
型號: HD40A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機(jī))
中文描述: 4位單片機(jī)(4位單片微計算機(jī))
文件頁數(shù): 104/133頁
文件大?。?/td> 803K
代理商: HD40A4639R
HD404639R Series
104
Comparator
The block diagram of the comparator is shown in figure 89. The comparator compares input voltage with
the reference voltage. Internal voltage or external input voltage can be selected as the reference. Internal
reference voltage is selected from sixteen levels.
Setting bit 3 (CER3) of the compare enable register (CER: $018) to 1 executes a voltage comparison.
When an input voltage at COMP
0
–COMP
3
is higher than the reference voltage, the TM or TMD command
sets the status flag (ST) high for the corresponding bits of the compare data register (CDR: $017) to
COMP
0
–COMP
3
. On the other hand, when an input voltage at COMP
0
–COMP
3
is lower, the TM or TMD
command clears the ST to 0.
S
S
S
+
2
4
Com-
parator
Comparator data
register (CDR)
Comparator enable
register (CER)
Comparator control
register (CCR)
I
COMP
0
COMP
1
COMP
2
COMP
3
VC
ref
5R
R
R
R
2R
Figure 89 Block Diagram of Comparator
Compare Enable Register (CER: $018):
Four-bit write-only register which enables comparator
operation, and selects the reference voltage and the analog input pin.
Compare Control Register (CCR: $016):
Four-bit write-only register which selects the internal reference
voltage from sixteen levels.
Compare Data Register (CDR: $017):
Four-bit read-only register which latches the result of the
comparison between the analog input pins and the reference voltage. Bits 0 to 3 show the results of
comparison with COMP
0
–COMP
3
, respectively. This register can be read only by the TM or TMD
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