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參數(shù)資料
| 型號： | UPD17149GT |
| 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)： | 15/102頁 |
| 文件大?。?/td> | 408K |
| 代理商： | UPD17149GT |
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15
μ
PD17145(A1), 17147(A1), 17149(A1)
1.3 Handling of Unused Pins
Handle unused pins as shown in the table below.
Table 1-1. Handling of Unused Pins
Handling
Pin Name
Internally
Externally
Open
Connect to V
DD
via pull-up resistor, or
to GND via pull-down resistor
Note 1
.
Directly connect to V
DD
or GND.
Open
Directly connect to GND.
Directly connect to V
DD
or GND.
Open
Directly connect to V
DD
.
Notes 1.
Take into consideration the drive capability and current dissipation of a port when the port is
externally pulled up or down. To pull up or down the port with a high resistance, exercise care
so that noise is not superimposed on the port pin. The appropriate value of the pull-up or pull-
down resistor differs depending on the application circuit. Generally, select a resistor of several
10 k
.
The P0F
0
/RLS pin is also used to set a test mode. When this pin is not used, do not connect a
pull-up resistor to it by mask option, but directly connect it to GND.
In an application circuit where a high reliability is required, be sure to input the RESET signal from
an external source. The RESET pin is also used to set a test mode. When this pin is not used,
directly connect it to V
DD
.
2.
3.
Caution
It is recommended to fix the input/output mode, pull-up resistor by software, and the output
level of the pin by repeatedly setting them in each loop of the program.
Connect on-chip pull-up resistor via
software.
—
Do not connect on-chip pull-up resistor
by mask option.
Connect on-chip pull-up resistor by mask
option.
Do not connect on-chip pull-up resistor
by mask option.
—
Output low level.
Do not connect pull-up on-chip resistor
via software, but output low level.
Connect on-chip pull-up resistor via
software and output high level.
Do not connect on-chip pull-up resistor
by mask option.
Connect on-chip pull-up resistor by mask
option.
Do not connect on-chip pull-up resistor
by mask option.
Connect on chip pull-up resistor by
mask option.
P0A, P0B, P0D, P0E
P0C
P0F
1
P0F
0
Note 2
P0A, P0B, P0C (CMOS
port)
P0D
(N-ch open-drain port)
P0E
(N-ch open-drain port)
External interrupt (INT)
RESET
Note 3
(when only internal
POC circuit is used)
Input
mode
Output
mode
Port
Open
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