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): 98/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
98
Bit
Initial value
Read/Write
Bit name
3
0
R
CER3
2
0
W
CER2
0
0
W
CER0
1
0
W
CER1
Comparator enable register (CER: $017)
CER1
0
1
Analog input mode selection
COMP
0
COMP
1
COMP
2
COMP
3
CER2
0
1
External reference power supply
Internal reference power supply
CER0
0
1
0
1
CER3
Voltage comparison result
Analog input voltage is lower than
reference voltage
Analog input voltage is higher than
reference voltage
0
1
Reference power supply selection
Figure 81 Comparator Enable Register (CER)
Comparator Start Flag (CMSF: $020, Bit 2):
Starts the comparator operation. The comparator starts the
voltage comparison by writing 1 to the comparator start flag (CMSF: $020, bit 2), and automatically
completes the voltage comparison after 4t
cyc
. The comparator start flag is then reset to 0. The comparison
result must be read after confirming that the comparator start flag is at 0. The comparator start flag is reset
to 0 by MCU reset.
Notes on Use
: RA
0
/COMP
0
–RA
3
/COMP
3
pins are used only for the comparator during voltage comparison.
These pins cannot be used for R ports.
The comparator operates only in the active and standby modes.
The switch for the internal power supply is turned on when the internal power supply is selected. The
switch is turned off except in active and standby modes.
When the external power supply is used for a reference voltage, R9
3
/VC
ref
must not be used as an R port.
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