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參數(shù)資料
| 型號(hào)： | HCD40C4344R |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī)) |
| 中文描述： | 4位HMCS400系列微電腦（4位單片微計(jì)算機(jī)） |
| 文件頁數(shù)： | 48/100頁 |
| 文件大?。?/td> | 610K |
| 代理商： | HCD40C4344R |
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HD404344R Series/HD404394 Series
48
Pull-Up MOS Transistor Control
Pull-up MOS, which can be controlled by software, is built into all input/output pins except R1
0
–R2
3
of the
HD404394 series.
The on/off status of all pull-up MOS pins is controlled by bit 3 (MIS3) of the miscellaneous register (MIS:
$00C) and the port data registers (PDR) of each pin. Each pin can therefore independently switch between
with or without pull-up MOS (table 17 and figure 24).
The on/off status of each transistor and the peripheral function mode of each pin can be set independently.
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
0
0
W
MIS0
1
0
W
MIS1
MIS2
PMOS On/Off
Selection for Pin R0
2
/SO
On
Miscellaneous register (MIS: $00C)
0
1
Off
MIS3
0
1
Pull-Up MOS
On/Off Selection
Pull-up MOS off
Pull-up MOS on
Programming MIS1 and MIS0 to 1 is prohibited.
Figure 24 Miscellaneous Register
How to Deal with Unused I/O Pins
When input/output pins are not being used and are left floating, it is necessary to set these pins to V
CC
to
reduce the possibility of LSI malfunctions due to noise. This can be done by selecting pull-up MOS for the
pins or by connecting an external pull-up resistor of about 100 k
at each unused pin.
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