DS2252T 데이터 시트보기 (PDF) - Maxim Integrated
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DS2252T Datasheet PDF : 16 Pages
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PIN ASSIGNMENT
PIN NAME
PIN
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
NAME
P1.5
P0.4
P1.6
P0.5
P1.7
P0.6
RST
P0.7
P3.0/RXD
SDI
PIN
NAME
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
PIN NAME
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,
12, 14, 16,
18
P0.0 - P0.7. General purpose I/O Port 0. This port is open-drain and cannot drive a
logic 1. It requires external pullups. Port 0 is also the multiplexed Expanded
Address/Data bus. When used in this mode, it does not require pullups.
1, 3, 5, 7, 9,
11, 13, 15
P1.0 - P1.7. General purpose I/O Port 1.
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.
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