SC73C1402
SOP•20/SSOP•20 project 3
P22
P23
P51
P52
P53
VDD
XT1
XT2
GND
1
2
3
4
5
6
7
8
9
20 P21
19 P20
18 P13
17 P12
16 P11
15 P10
14 P03
13 P02
12 P01
11 P00
RSTN 10
PIN DESCRIPTION
Symbol
Description
VDD
Power supply (2.0V~4.0V)
Reset ˄active low˅
GND
RSTN
P50
P•channel open•drain output
Crystal oscillator output
Crystal oscillator input
XT1
XT2
4•bit input pin (with internal pull•down resistor). This pin is used for keyboard scan and to
control internal circuit.
P00~P03
4•bit I/O port (It can be set to input or output by program, with internal pull•down resistor).
In input mode, it can be used for keyboard scan.
P10~P13
In output mode, used for keyboard scan output.
4•bit I/O port (It can be set to input or output by program, with internal pull•down resistor).
In input mode, it can be used for keyboard scan.
P20~P23
P30~P33
P52
In output mode, can be used for keyboard scan output.
4•bit output pin can be used for keyboard scan output.
It can be set input/output mode by mask option.
In output mode, have large current when output high level(can be used to drive LED).
In input mode, it can be used for keyboard scan input.
Outputs remote signal with carrier.
P53
It can be set input/output mode by mask option.
P51
In output mode, it can be used for keyboard scan output.
In input mode, it can be used for keyboard scan input.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
REV:1.1
2005.12.19
Http: www.silan.com.cn
Page 4 of 20
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