參數(shù)資料
型號: UPD17149
廠商: NEC Corp.
英文描述: SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 小,通用4位單晶片微控制器
文件頁數(shù): 16/102頁
文件大?。?/td> 408K
代理商: UPD17149
16
μ
PD17145(A1), 17147(A1), 17149(A1)
1.4 Note on Using RESET and P0F
0
/RLS Pins
The RESET and P0F
0
/RLS pins also have a function to set a test mode in which the internal operation of the
μ
PD17149(A1) is tested (for IC test only), in addition to the function described in
1.1 Pin Function
.
If a voltage higher than V
DD
is applied to these pins, the test mode is set. If a noise higher than V
DD
is
superimposed on these pins during normal operation, therefore, the test mode is set by mistake, affecting normal
operation.
If the wiring length of the RESET or P0F
0
/RLS pin is too long, for example, noise may be superimposed on
the pin.
To prevent this, the wiring length must be kept as short as possible. Otherwise, use a diode or capacitor as
shown below.
G
G
Connect a low-V
F
diode between V
DD
and RESET, P0F
0
/RLS
G
G
Connect a capacitor between V
DD
and RESET, P0F
0
/RLS
V
DD
V
DD
RESET, P0F
0
/RLS
V
DD
V
DD
RESET, P0F
0
/RLS
Diode with
low V
F
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