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參數(shù)資料
| 型號(hào)： | UPD75208CW |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機(jī) |
| 文件頁數(shù)： | 11/62頁 |
| 文件大小： | 497K |
| 代理商： | UPD75208CW |
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11
μ
PD75208
Connect diode with small V
F
(0.3 V or less) between
the pins and V
DD
Connect a capacitor between the pins and V
DD
.
3.6
XT1, XT2 AND P50 PIN OPERATING PRECAUTIONS
When selecting the 32.768 kHz subsystem clock connected to the XT1 and XT2 pins as the watch timer source
clock, the signal to be input or output to the P50 pin next to the XT2 pin must be a signal required to be switched
between high and low the minimum number of times (once/second or less).
If the P50 pin signal is switched frequently between high and low, a spike is generated in the XT2 pin because
of capacitance coupling of the P50 and XT2 pins and the correct watch functions cannot be achieved (the watch
becomes fast).
If it is necessary to allow the P50 pin signal to switch between high and low, mount an external capacitor to the
P50 pin as shown below.
3.5
P00/INT4 PIN AND RESET PIN OPERATING PRECAUTIONS
P00/INT4 and RESET pins have the function (especially for IC test) to test uPD75208 internal operations in addition
to the functions described in sections 3.1 and 3.2.
The test mode is set when a voltage larger than V
DD
is applied to one of these pins. If noise larger than V
DD
is
applied in normal operation, the test mode may be set thereby adversely affecting normal operation.
Since there is a display output pin having a high-voltage amplitude (35 V) next to the P00/INT4 and RESET pins,
if cables for the related signals are routed in parallel, wiring noise larger than V
DD
may be applied to the P00/INT4
and RESET pins causing errors.
Thus, carry out wiring so that wiring noise can be minimized, If noise still cannot be suppressed, take the measure
against noise using the following external components.
V
DD
V
DD
P00/INT4, RESET
V
DD
V
DD
P00/INT4, RESET
XT1
32.768 kHz
0.0068 F
XT2
P50
PD75208
μ
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