參數(shù)資料
型號(hào): HD4074449
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(yè)數(shù): 46/123頁(yè)
文件大?。?/td> 726K
代理商: HD4074449
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HD404449 Series
46
Ports R5
1
–R5
3
are multiplexed with peripheral function pins
SCK
2
,
SI
2
, SO
2
, respectively. The function
modes of these pins can be selected by individual pins, by 2A setting bit 3 (SM2A3) of serial mode register
2A (SM2A: $01B), and bits 2 and 3 (PMRA2, PMRA3) of port mode register A (PMRA: $004) (figures 36
and 37).
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
12
and D
13
. 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 38).
The on/off status of each transistor and the peripheral function mode of each pin can be set independently.
How to Deal with Unused I/O Pins:
I/O pins that are not needed by the user system (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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