DS2252T View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated
Part Name
Description
Manufacturer
DS2252T Datasheet PDF : 14 Pages
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DS2252T
PIN ASSIGNMENT
1
P1.0
11
P1.5
21
P3.1 TXD
31
P3.6 WR
2
VCC
3
P1.1
12
P0.4
13
P1.6
22
ALE
32
P2.4
23
P3.2 INT0
33
P3.7 RD
4
P0.0
14
P0.5
24
PROG
34
P2.3
5
P1.2
15
P1.7
25
P3.3 INT1
35
XTAL2
6
P0.1
16
P0.6
26
P2.7
36
P2.2
7
P1.3
17
RST
27
P3.4 T0
37
XTAL1
8
P0.2
18
P0.7
28
P2.6
38
P2.1
9
P1.4
19
P3.0 RXD
29
P3.5 T1
39
GND
10
P0.3
20
SDI
30
P2.5
40
P2.0
PIN DESCRIPTION
PIN
DESCRIPTION
4, 6, 8, 10, P0.0 – P0.7. General purpose I/O Port 0. This port is open–drain and can not drive a logic 1.
12, 14, 16, 18 It requires external pull–ups. Port 0 is also the multiplexed Expanded Address/Data bus.
When used in this mode, it does not require pull–ups.
1, 3, 5, 7, 9, P1.0 – P1.7. General purpose I/O Port 1.
11, 13, 15
40, 38, 36,
34, 32, 30,
28, 26
P2.0 – P2.7. General purpose I/O Port 2. Also serves as the MSB of the Expanded Address
bus.
19
P3.0 RXD. General purpose I/O port pin 3.0. Also serves as the receive signal for the on
board UART. This pin should NOT be connected directly to a PC COM port.
21
P3.1 TXD. General purpose I/O port pin 3.1. Also serves as the transmit signal for the on
board UART. This pin should NOT be connected directly to a PC COM port.
23
P3.2 INT0. General purpose I/O port pin 3.2. Also serves as the active low External Interrupt
0. This pin is also connected to the INTP output of the DS1283 Real Time Clock.
25
P3.3 INT1. General purpose I/O port pin 3.3. Also serves as the active low External
Interrupt 1.
27
P3.4 T0. General purpose I/O port pin 3.4. Also serves as the Timer 0 input.
29
P3.5 T1. General purpose I/O port pin 3.5. Also serves as the Timer 1 input.
31
P3.6 WR. General purpose I/O port pin. Also serves as the write strobe for Expanded bus
operation.
33
P3.7 RD. General purpose I/O port pin. Also serves as the read strobe for Expanded bus
operation.
17
RST – Active high reset input. A logic 1 applied to this pin will activate a reset state. This pin
is pulled down internally, can be left unconnected if not used. An RC power–on reset circuit
is not needed and is NOT recommended.
22
ALE – Address Latch Enable. Used to de–multiplex the multiplexed Expanded Address/Data
bus on Port 0. This pin is normally connected to the clock input on a ’373 type transparent
latch.
121395 4/14
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