參數(shù)資料
型號: HD407A4669
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
中文描述: 低電壓如同在微機芯片的DTMF產生電路(帶雙音多頻電路的低電壓微計算機)
文件頁數(shù): 98/142頁
文件大?。?/td> 894K
代理商: HD407A4669
HD404669 Series
98
Comparator
The MCU has a built-in comparator that compare an input voltage with the reference voltage (V
Cref
). The
comparator block diagram is shown in figure 76.
The comparator can operate in active mode and subactive mode. They are halted in other modes.
2
Compare enable
register (CER)
Compare data
register (CDR)
COMP
0
COMP
1
VC
ref
Comparator
-
+
S
I
Figure 76 Comparator Block Diagram
Comparator Operation
(1) Analog input pin selection is performed by bits 0 and 1 (CER0, CER1) of the compare enable
register (CER). Setting bit 3 (CER3) to 1 places the RD
0
/COMP
0
and RD
1
/COMP
1
pins in analog
input mode and starts comparator operation. While comparator operation is in progress, none of
these pins (including pins not used for comparison) can be used as R port pins.
(2) The compare result can be read by means of a bit test instruction (TM or TMD) on the compare data
register (CDR) bit corresponding to the selected analog input pin.
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