73S1209F Data Sheet
DS_1209F_004
1 Hardware Description
1.1 Pin Description
Table 1: 73S1209F Pinout Description
Pin Name
Description
Figure 26 MPU clock crystal oscillator input pin. A 1MΩ resistor is
X12IN
10
11
8
9
I
required between pins X12IN and X12OUT.
X12OUT
O
I
Figure 26 MPU clock crystal oscillator output pin.
Figure 32
ROW (5:0)
Keypad row input sense.
0
1
2
3
4
5
21
22
24
34
37
38
COL(4:0)
12
13
14
16
19
O
Figure 33 Keypad column output scan pins.
0
1
2
3
4
USR(8:0)
IO
Figure 29 General-purpose user pins, individually configurable as
inputs or outputs or as external input interrupt ports.
0
1
2
3
4
5
6
7
8
36
35
33
31
30
29
23
20
32
24
23
22
21
20
19
14
13
SCL
5
5
O
Figure 28 I2C (master mode) compatible Clock signal. Note: the
pin is configured as an open drain output. When the
I2C interface is being used, an external pull up resistor
is required. A value of 3K is recommended.
SDA
6
6
IO
Figure 27 I2C (master mode) compatible data I/O. Note: this pin is
bi-directional. When the pin is configured as output, it is
an open drain output. When the I2C interface is being
used, an external pull up resistor is required. A value of
3K is recommended.
LED(1:0)
0
1
Figure 34
Special output drivers, programmable pull-down current
to drive LEDs. May also be used as inputs.
1
3
3
4
IO
RXD
TXD
INT3
17
18
51
11
12
I
O
I
Figure 31 Serial UART Receive data pin.
Figure 28 Serial UART Transmit data pin.
Figure 31 General purpose interrupt input.
8
Rev. 1.2