參數(shù)資料
型號: HD4074459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計算機(jī))
文件頁數(shù): 95/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
95
Comparator
The comparator (figure 78) compares an analog input voltage with a reference voltage. Either a 16-level
internal or external reference power supply can be selected.
The voltage comparison is started by writing 1 to the comparator start flag (CMSF: $020, bit 2), and is
completed after 4t
cyc
. The comparison result is stored into bit 3 (CER: $017, bit 3) of the comparator enable
register, and can be read by the bit test instruction (TM or TMD). The comparison result must be read after
confirming that the comparator start flag (CMSF: $020, bit 2) is at 0 (figure 79).
COMP
Comparator
control register
(CCR)
Comparator
start flag
(CMSF)
Comparator
enable register
(CER)
Internal data bus
R9
3
/VC
ref
RA
0
/COMP
0
RA
1
/COMP
1
RA
2
/COMP
2
RA
3
/COMP
3
4
4
1
1
1
1
3
2
S
S
S
Figure 78 Block Diagram of Comparator
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