參數(shù)資料
型號： DS89C440-QNL
廠商： Maxim Integrated Products
文件頁數(shù)： 5/46頁
文件大?。?/td> 0K
描述： IC MCU FLASH 32KB 33MHZ 44-PLCC
標(biāo)準(zhǔn)包裝： 26
系列： 89C
核心處理器： 8051
芯體尺寸： 8-位
速度： 33MHz
連通性： EBI/EMI，SIO，UART/USART
外圍設(shè)備： 電源故障復(fù)位，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 32KB（32K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-LCC（J 形引線）
包裝： 管件
DS89C430/DS89C450 Ultra-High-Speed Flash Microcontrollers
13 of 46
PIN DESCRIPTION (continued)
PIN
PDIP
PLCC
TQFP
NAME
FUNCTION
1
2
40
P1.0
2
3
41
P1.1
3
4
42
P1.2
4
5
43
P1.3
5
6
44
P1.4
6
7
1
P1.5
7
8
2
P1.6
8
9
3
P1.7
Port 1, I/O. Port 1 functions as both an 8-bit, bidirectional I/O port and an alternate
functional interface for timer 2 I/O, new external interrupts, and new serial port 1. The
reset condition of port 1 is with all bits at logic 1. In this state, a weak pullup holds the port
high. This condition also serves as an input state, since any external circuit that writes to
the port overcomes the weak pullup. When software writes a 0 to any port pin, the
DS89C430/DS89C450 activate a strong pulldown that remains on until either a 1 is
written or a reset occurs. Writing a 1 after the port has been at 0 causes a strong
transition driver to turn on, followed by a weaker sustaining pullup. Once the momentary
strong driver turns off, the port again becomes the output high (and input) state. The
alternate functions of port 1 are as follows:
PORT
ALTERNATE
FUNCTION
P1.0
T2
External I/O for Timer/Counter2
P1.1
T2EX
Timer 2 Capture/Reload Trigger
P1.2
RXD1
Serial Port 1 Receive
P1.3
TXD1
Serial Port 1 Transmit
P1.4
INT2
External Interrupt 2 (Positive Edge Detect)
P1.5
INT3
External Interrupt 3 (Negative Edge Detect)
P1.6
INT4
External Interrupt 4 (Positive Edge Detect)
P1.7
INT5
External Interrupt 5 (Negative Edge Detect)
21
24
18
P2.0 (A8)
22
25
19
P2.1 (A9)
23
26
20
P2.2 (A10)
24
27
21
P2.3 (A11)
25
28
22
P2.4 (A12)
26
29
23
P2.5 (A13)
27
30
24
P2.6 (A14)
28
31
25
P2.7 (A15)
Port 2 (A8–A15), I/O. Port 2 is an 8-bit, bidirectional I/O port. The reset condition of port 2
is logic high. In this state, a weak pullup holds the port high. This condition also serves as
an input mode, since any external circuit that writes to the port overcomes the weak
pullup. When software writes a 0 to any port pin, the DS89C430/DS89C450 activate a
strong pulldown that remains on until either a 1 is written or a reset occurs. Writing a 1
after the port has been at 0 causes a strong transition driver to turn on, followed by a
weaker sustaining pullup. Once the momentary strong driver turns off, the port again
becomes both the output high and input state. As an alternate function, port 2 can function
as the MSB of the external address bus when reading external program memory and
read/write external RAM or peripherals. In page mode 1, port 2 provides both the MSB and
LSB of the external address bus. In page mode 2, it provides the MSB and data.
10
11
5
P3.0
11
13
7
P3.1
12
14
8
P3.2
13
15
9
P3.3
14
16
10
P3.4
15
17
11
P3.5
16
18
12
P3.6
17
19
13
P3.7
Port 3, I/O. Port 3 functions as both an 8-bit, bidirectional I/O port and an alternate
functional interface for external interrupts, serial port 0, timer 0 and 1 inputs, and RD and
WR
strobes. The reset condition of port 3 is with all bits at a logic 1. In this state, a weak
pullup holds the port high. This condition also serves as an input mode, since any external
circuit that writes to the port overcomes the weak pullup. When software writes a 0 to any
port pin, the DS89C430/DS89C450 activate a strong pulldown that remains on until either
a 1 is written or a reset occurs. Writing a 1 after the port has been at 0 causes a strong
transition driver to turn on, followed by a weaker sustaining pullup. Once the momentary
strong driver turns off, the port again becomes both the output high and input state. The
alternate modes of port 3 are as follows:
PORT
ALTERNATE
FUNCTION
P3.0
RXD0
Serial Port 0 Receive
P3.1
TXD0
Serial Port 0 Transmit
P3.2
INT0
External Interrupt 0
P3.3
INT1
External Interrupt 1
P3.4
T0
Timer 0 External Input
P3.5
T1
Timer 1 External Input
P3.6
WR
External Data Memory Write Strobe
P3.7
RD
External Data Memory Read Strobe
31
35
29
EA
External Access. Allows selection of internal or external program memory. Connect to
ground to force the DS89C430/DS89C450 to use an external memory program memory.
The internal RAM is still accessible as determined by register settings. Connect to VCC to
use internal flash memory.
相關(guān)PDF資料
PDF描述
DS89C440-QNG IC MCU FLASH 32KB 25MHZ 44-PLCC
DS89C440-MNL IC MCU FLASH 32KB 33MHZ 40-DIP
DS89C440-MNG IC MCU FLASH 32KB 25MHZ 40-DIP
DS89C440-ENL IC MCU FLASH 32KB 33MHZ 44-TQFP
DS89C440-ENG IC MCU FLASH 32KB 25MHZ 44-TQFP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS89C440-QNL+ 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C440-XXX 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C450 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Ultra-High-Speed Flash Microcontrollers
DS89C450+ENG 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 64KB FLASH 5V 44TQFP - Trays
DS89C450+ENL 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 64KB FLASH 5V 44TQFP - Trays
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