參數(shù)資料
型號: HD404448
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 98/123頁
文件大?。?/td> 726K
代理商: HD404448
HD404449 Series
98
Note on Use:
Use the SEM and SEMD instructions to write data to the A/D start flag (ADSF: $020, bit 2),
but make sure that the A/D start flag is not written to during A/D conversion. Data read from the A/D data
register (ADRL: $017, ADRU: $018) during A/D conversion cannot be guaranteed.
The A/D converter does not operate in the stop, watch, and subactive modes because of the OSC clock.
During these low-power dissipation modes, current through the resistor ladder is cut off to decrease the
power input.
Bit
Initial value
Read/Write
Bit name
3
0
W
AMR3
2
0
W
AMR2
0
0
W
AMR0
1
Not used
A/D mode register (AMR: $016)
AMR0
0
1
Conversion time
34t
cyc
67t
cyc
AMR3
0
0
1
1
AMR2
0
1
0
1
Analog input selection
AN
0
AN
1
AN
2
AN
3
Figure 82 A/D Mode Register (AMR)
3
2
1
0
MSB
LSB
3
2
1
0
Bit 0
Bit 7
ADRU: $018
ADRL: $017
Figure 83 A/D Data Registers
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