參數(shù)資料
型號(hào)： DS87C520-QCL
英文描述： EPROM/ROM High-Speed Micro
中文描述： 存儲(chǔ)器/ ROM的高速微
文件頁(yè)數(shù)： 5/45頁(yè)
文件大?。?/td> 1415K
代理商： DS87C520-QCL
DS87C520/DS83C520 EPROM/ROM High-Speed Microcontrollers
5 of 45
PIN DESCRIPTION (continued)
PIN
DIP
PLCC
TQFP
NAME
FUNCTION
30
33
27
ALE
Address Latch Enable Output
. The ALE 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. ALE has a pulse width of 1.5
XTAL1 cycles and a period of four XTAL1 cycles. ALE is forced
high when the DS87C520/DS83C520 are in a reset condition. ALE
can also be disabled and forced high by writing ALEOFF = 1
(PMR.2). ALE operates independently of ALEOFF during external
memory accesses.
39
43
37
P0.0 (AD0)
38
42
36
P0.1 (AD1)
37
41
35
P0.2 (AD2)
36
40
34
P0.3 (AD3)
35
39
33
P0.4 (AD4)
34
38
32
P0.5 (AD5)
33
37
31
P0.6 (AD6)
32
36
30
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 ROM and read/write external RAM
memory or peripherals. When used as a memory bus, the port
provides active high drivers. The reset condition of Port 0 is tri-state.
Pullup resistors are required when using Port 0 as an I/O port.
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 a logic 1. In this state, a weak pullup holds the port high.
This condition also serves as an input 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 will overcome the weak pullup.
When software writes a 0 to any port pin, the DS87C520/DS83C520
will 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 will
cause 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
modes of Port 1 are out-lines as follows.
Port
Alternate
Function
P1.0
T2 External I/O for Timer/Counter 2
P1.1
T2EX EX Timer/Counter 2 Capture/Reload Trigger
P1.2
RXD1
Serial Port 1 Input
P1.3
TXD1
Serial Port 1 Output
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)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS87C520-QCL/T&R 制造商:Maxim Integrated Products 功能描述:MICRO,OTP,HI SPD 44PLCC 33MHZ TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU EPROM/ROM 33MHZ HS 44PLCC
DS87C520-QCL/T&R 功能描述:8位微控制器 -MCU EPROM/ROM High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
DS87C520-QCL+ 功能描述:8位微控制器 -MCU EPROM/ROM High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
DS87C520-QCL+T&R 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC 16KB EPROM 5V 44PLCC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU EPROM/ROM 33MHZ HS 44PLCC
DS87C520-QCL+T&R 功能描述:8位微控制器 -MCU EPROM/ROM High-Speed RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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