參數(shù)資料
型號(hào)： HD404458
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系列微機(jī)（4位單片微計(jì)算機(jī)）
文件頁數(shù)： 55/120頁
文件大小： 692K
代理商： HD404458
HD404459 Series
55
Pull-Up MOS Transistor Control:
A program-controlled pull-up MOS transistor is provided for each
input/output pin other than input-only pins D
10
, D
11
, R9
3
, and RA
0
–RA
3
. The on/off status of all these
transistors is controlled by bit 3 (MIS3) of the miscellaneous register (MIS: $00C), and the on/off status of
an individual transistor can also be controlled by the port data register (PDR) of the corresponding pin—
enabling on/off control of that pin alone (table 23 and figure 39).
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
CMOS buffer
on/off selection
for pin R4
3
/SO
On
Miscellaneous register (MIS: $00C)
0
1
Off
Refer to figure 18 in the
operation modes section.
t
RC
selection.
MIS3
0
1
Pull-up MOS
on/off selection
Off
On
MIS1
MIS0
Figure 39 Miscellaneous Register (MIS)
How to Deal with Unused I/O Pins:
I/O pins that are not needed by the user system (those that remain
floating) must be connected to V
CC
to prevent LSI malfunctions due to noise. These pins must either be
pulled up to V
CC
by their pull-up MOS transistors or by resistors of about 100 k
.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404458H 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459H 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HD404508FS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
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