DS2252T(2000) Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS2252T Datasheet PDF : 15 Pages
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PIN ASSIGNMENT
1 P1.0
11
2 VCC
12
3 P1.1
13
4 P0.0
14
5 P1.2
15
6 P0.1
16
7 P1.3
17
8 P0.2
18
9 P1.4
19
10 P0.3
20
P1.5
P0.4
P1.6
P0.5
P1.7
P0.6
RST
P0.7
P3.0 RXD
SDI
21 P3.1 TXD
22 ALE
23 P3.2 INT0
24 PROG
25 P3.3 INT1
26 P2.7
27 P3.4 T0
28 P2.6
29 P3.5 T1
30 P2.5
DS2252T
31 P3.6 WR
32 P2.4
33 P3.7 RD
34 P2.3
35 XTAL2
36 P2.2
37 XTAL1
38 P2.1
39 GND
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
12, 14, 16, 1. It requires external pullups. Port 0 is also the multiplexed Expanded Address/Data bus.
18
When used in this mode, it does not require pullups.
1, 3, 5, 7,
9, 11, 13, P1.0 - P1.7. General purpose I/O Port 1.
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.
P3.2 INT0 . General purpose I/O port pin 3.2. Also serves as the active low External
23
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.
RST - Active high reset input. A logic 1 applied to this pin will activate a reset state. This
17
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.
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