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| 型號(hào)： | DS89C420 |
| 英文描述： | Ultra-High-Speed Microcontroller |
| 中文描述： | 超高速微控制器 |
| 文件頁數(shù)： | 4/59頁 |
| 文件大?。?/td> | 539K |
| 代理商： | DS89C420 |
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DS89C420
4 of 59
Table 1. Pin Description
PIN
PLCC
12, 44
DIP
40
TQFP
6, 38
NAME
FUNCTION
V
CC
V
CC
- +5V
20
1, 22, 23,
34
10
16, 17,
28, 39
4
GND
GND.
Logic Ground
9
RST
External Reset.
The RST input pin is bidirectional and contains
a Schmitt trigger to recognize external active-high reset inputs.
The pin also employs an internal pulldown resistor to allow for a
combination of wire OR’d external reset sources. An RC is not
required for power-up, since the device provides this function
internally.
19
18
21
20
15
14
XTAL1
XTAL2
XTAL1, XTAL2.
The crystal oscillator pins XTAL1 and
XTAL2 provide support for fundamental mode parallel resonant,
AT cut crystals. XTAL1 also acts as an input if there is an
external clock source in place of a crystal. XTAL2 serves as the
output of the crystal amplifier.
29
32
26
PSEN
Program Store Enable.
This signal is commonly connected to
optional external program memory as a chip enable.
PSEN
provides an active-low pulse and is driven high when external
program memory is not being accessed. In 1-cycle page mode 1,
PSEN
remains low for consecutive page hits.
30
33
27
ALE/
PROG
Address Latch Enable.
Functions as a clock to latch the
external address LSB from the multiplexed address/data bus on
Port 0. This signal is commonly connected to the latch enable of
an external 373 family transparent latch. In default mode, ALE
has a pulse width of 1.5 XTAL1 cycles and a period of four
XTAL1 cycles. In page mode, the ALE pulse width is altered
according to the page mode selection. In traditional 8051 mode,
ALE is high when using the EMI reduction mode and during a
reset condition. ALE can be enabled by writing ALEON = 1
(PMR.2). Note that ALE operates independently of ALEON
during external memory accesses. As an alternate mode, this pin
(
PROG
) is used to execute the parallel program function.
39
38
37
36
35
34
33
32
43
42
41
40
39
38
37
36
37
36
35
34
33
32
31
30
P0.0 (AD0)
P0.1 (AD1)
P0.2 (AD2)
P0.3 (AD3)
P0.4 (AD4)
P0.5 (AD5)
P0.6 (AD6)
P0.7 (AD7)
Port 0 (AD0–7), I/O
. Port 0 is an open-drain 8-bit, bidirectional
I/O port. As an alternate function, Port 0 can function as the
multiplexed address/data bus to access off-chip memory. During
the time when ALE is high, the LSB of a memory address is
presented. When ALE falls to a logic 0, the port transitions to a
bidirectional data bus. This bus is used to read external program
memory and read/write external RAM or peripherals. When
used as a memory bus, the port provides weak pullups for logic
1 outputs. The reset condition of Port 0 is three-state. Pullup
resistors are required when using Port 0 as an I/O port.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS89C420_02 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller |
| DS89C420_05 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Ultra-High-Speed Microcontroller |
| DS89C420-ECL | 功能描述:IC MCU ULTRA 33MHZ HP 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
| DS89C420-ECS | 功能描述:IC MCU 50MHZ ULTRA HS 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
| DS89C420-ENG | 功能描述:IC MCU ULTRA 25MHZ HP 44-TQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
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