參數(shù)資料
型號: UPD75004CU
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 4位單片機
文件頁數(shù): 15/66頁
文件大?。?/td> 542K
代理商: UPD75004CU
μ
PD75004, 75006, 75008
15
3.6
NOTES ON USING THE P00/INT4, AND RESET PINS
In addition to the functions described in Sections 3.1 PORT PINS and 3.2 NON PORT PINS, an exclusive
function for setting the test mode, in which the internal fuctions of the
μ
PD75008 are tested (solely used for
IC tests), is provided to the P00/INT4 and
RESET
pins.
If a voltage exceeding V
DD
is applied to either of these pins, the
μ
PD75008 is put into test mode. Therefore,
even when the
μ
PD75008 is in normal operation, if noise exceeding the V
DD
is input into any of these pins, the
μ
PD75008 will enter the test mode, and this will cause problems for normal operation.
As an example, if the wiring to the P00/INT4 pin or the
RESET
pin is long, stray noise may be picked up
and the above montioned problem may occur.
Therefore, all wiring to these pins must be made short enough to not pick up stray noise. If noise cannot
be avoided, suppress the noise using a capacitor or diode as shown in the figure below.
Connect a capacitor across P00/INT4 and
RESET, and V
DD
.
V
DD
V
DD
P00/INT4, RESET
V
DD
V
DD
P00/INT4, RESET
Low V
F
diode
Connect a diode having a low V
F
across
P00/INT4 and RESET, and V
DD
. (0.3 V max.)
#
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