參數(shù)資料
型號(hào)： UPD17P207GF-001-3B9
元件分類： 微控制器/微處理器
英文描述： 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP80
封裝： 14 X 20 MM, PLASTIC, QFP-80
文件頁(yè)數(shù)： 5/34頁(yè)
文件大?。?/td> 311K
代理商： UPD17P207GF-001-3B9
PD17P207
11
1.4
PROCESSING OF UNUSED PINS
In ordinay operation mode, process unused pins as follows:
Table 1-1. Processing of Unused Pins
(a)
Port pins
Recommended Processing of Unused Pins
Pin Name
Internally
Externally
Input Mode
P0A
(Connect pull-up resistor.)
Open
P0C
–
Directly connect to GND.
P0D, P1A
–
Connect each pin to VDD or GND via
resistor
Note.
Output Mode
P0A (CMOS port)
Outputs high level
Open
P0D, P1A (CMOS port)
–
P0B, P0C (N-ch open-drain port)
Outputs low level
Note
When externally pulling a pin up (connecting the pin to VDD via resistor) and down (connecting the pin to
GND via resistor), give adequate consideration to the drive capability and current consumption of the
port. To pull a pin up or down at a high resistance, make sure that no noise is superimposed on the pin.
(b)
Pins other than port pins
Pn Name
I/O Mode
Recommended Processing of Unused Pin
ADC0-ADC3
Input
Directly connect to GND
CAPH, CAPL
Output
Open
COM0, COM1, COM2/LCD35, COM3/LCD34
Output
Open
INT
Note
Input
Directly connect to GND
LCD0-LCD33
Output
Open
REM
Output
Open
VADC
–
Directly connect to VDD
VLCD0-VLCD2
Output
Open
VLCDC
–
Directly connect to VDD or VLCD0
WDOUT
Output
Directly connect to GND
XIN, XTIN
Input
Directly connect to GND
XOUT
–
Directly connect to VDD
XTOUT
–
Directly connect to VREG
Note
The INT pin is also used as a test mode setting pin. Directly connect this pin to GND when it is not used.
Cautions 1.
It is recommended that the input/output mode and output level of a pin be fixed by repeatedly
setting in each loop of the program.
2. When the LCD controller/driver is not used, stop the voltage regulator by using the display mode
register.
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