參數(shù)資料
型號(hào)： DS2250T
廠商： Maxim Integrated Products, Inc.
英文描述： Soft Microcontroller Module(軟件微控制器模塊)
中文描述： 柔性微控制器模塊
文件頁(yè)數(shù)： 4/20頁(yè)
文件大?。?/td> 163K
代理商： DS2250T
DS2250(T)
021998 4/20
PIN DESCRIPTION
PIN
DESCRIPTION
1, 3, 5, 7, 9,
, , , , ,
11, 13, 15
P1.0 – P1.7.
General purpose I/O Port 1
p p
17
RST
– Active high reset input. A logic 1 applied to this pin will activate a reset state. This pin is
pulled down internally so this pin can be left unconnected if not used. An RC power–on reset
circuit is not needed and is not recommended.
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.
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.
35, 37
XTAL2, XTAL1.
Used to connect an external crystal to the internal oscillator. XTAL1 is the
input to an inverting amplifier and XTAL2 is the output.
39
GND
– Logic ground.
26, 28, 30,
32, 34, 36,
38, 40
P2.7–P2.0.
General purpose I/O Port 2. Also serves as the MSB of the Expanded Address
bus.
24
PSEN
– Program Store Enable. This active low signal is used to enable an external program
memory when using the Expanded bus. It is normally an output and should be unconnected if
not used. PSEN also is used to invoke the Bootstrap Loader. At this time, PSEN will be pulled
down externally. This should only be done once the DS2250(T) is already in a reset state. The
device that pulls down should be open drain since it must not interfere with PSEN under normal
operation.
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. When
using a parallel programmer, this pin also assumes the PROG function for programming pulses.
20
EA
– External Access. This pin forces the DS2250(T) to behave like an 8031. No internal memory
(or clock) will be available when this pin is at a logic low. Since this pin is pulled down internally,
it should be connected to +5V to use NV RAM. In an parallel programmer, this pin also serves
as V
PP
for super voltage pulses.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2250T08-08 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
DS2250T08-12 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
DS2250T-08-16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
DS2250T16-08 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
DS2250T16-12 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller
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