參數(shù)資料
型號(hào)： UPD17201AGF
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機(jī)與LCD控制器/驅(qū)動(dòng)器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁(yè)數(shù)： 12/120頁(yè)
文件大?。?/td> 516K
代理商： UPD17201AGF
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μ
PD17201A, 17207
12
3.3
PROCESSING OF UNUSED PINS
Process unused pins as follows:
Table 3-1 Processing of Unused Pins
(a) Port pins
Pin Name
Recommended Processing of Unused Pins
Internally
Externally
Input mode
P0A
(Connect pull-up resistor.)
Open.
P0C
–
Directly connect to GND.
P0D, P1A
–
Connect each pin to V
DD
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 pulling this pin up (connecting the pin to V
DD
via resistor) or down (connect the pin to GND via
resistor), exercise care not to decrease the drive capability or increase the power consumption of the
port. When a high resistance is used for pulling up or down, make sure that noise is not superimposed
on the pin.
(b) Pins other than port pins
Pin Name
I/O Format
Recommended Processing of Unused Pin
ADC
0
-ADC
3
Input
Directly connect to GND.
CAPH, CAPL
Output
Open
COM
0
, COM
1
, COM
2
/LCD
35
, COM
3
/LCD
34
Output
Open
INT
Note
Input
Directly connect to GND.
LCD
0
-LCD
33
Output
Open
REM
Output
Open
V
ADC
–
Directly connect to V
DD
.
V
LCD0
-V
LCD2
Output
Open
V
LCDC
–
Directly connect to V
DD
or V
LCD0
.
WDOUT
Output
Directly connect to GND.
X
IN
, XT
IN
Input
Directly connect to GND.
X
OUT
–
Directly connect to V
DD
.
XT
OUT
–
Directly connect to V
REG
.
Note
Because 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 to fix the input or output mode and the output level of the pin by
repeatedly setting them in each loop of the program.
2. Stop the voltage booster circuit by using the display mode register when the LCD driver/
controller is not in use.
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