參數(shù)資料
型號(hào)： DS87C550-QNL
廠(chǎng)商： Maxim Integrated Products
文件頁(yè)數(shù)： 5/49頁(yè)
文件大小： 0K
描述： IC MCU EPROM ADC/PWM HS 68-PLCC
標(biāo)準(zhǔn)包裝： 18
系列： 87C
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，PWM，WDT
輸入/輸出數(shù)： 55
程序存儲(chǔ)器容量： 8KB（8K x 8）
程序存儲(chǔ)器類(lèi)型： OTP
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 6x10b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 68-LCC（J 形引線(xiàn)）
包裝： 管件
DS87C550 EPROM High-Speed Microcontroller with ADC and PWM
13 of 49
that may not have fast RAM in place. Internal SRAM access is always at full speed regardless of the
Stretch setting. When maximum speed is desired, software should select a Stretch value of 0. When using
very slow RAM or peripherals, the application software can select a larger Stretch value. Note that this
affects data memory accesses only and that there is no way to slow the accesses to program memory other
than to use a slower crystal (or external clock).
The specific timing of the variable speed Stretch MOVX is provided in the Electrical Specifications
section of this data sheet. Table 4 shows the resulting MOVX instruction timing and the read or write
strobe widths for each Stretch value.
DATA MEMORY CYCLE STRETCH VALUES Table 4
CKCON.2-0
MOVX MACHINE
RD
OR WR STROBE WIDTH
M2
M1
M0
CYCLES
IN MACHINE CYCLES
0
2 (forced internal)
0.5
0
1
3 (default external)
1
0
1
0
4
2
0
1
5
3
1
0
9
4
1
0
1
10
5
1
0
11
6
1
12
7
Dual Data Pointer With Inc/Dec
The DS87C550 contains several new, unique features that are associated with the Data Pointer register. In
the original 8051 architecture, the DPTR was a 16-bit value that was used to address off-chip data RAM
or peripherals. To improve the efficiency of data moves, the DS87C550 contains two Data Pointer
registers (DPTR0 and DPTR1). By loading one DPTR with the source address and the other with the
destination address, block data moves can be made much more efficient. Since DPTR0 is located at the
same address as the single DPTR in the original 8051 architecture, code written for the original
architecture will operate normally on the DS87C550 with no modification necessary.
The second data pointer, DPTR1 is located at the next two register locations (up from DPTR0) and is
selected using the data pointer select bit SEL (DPS.0). If SEL = 0, then DPTR0 is the active data pointer.
Conversely, if SEL = 1, then DPTR1 is the active data pointer. Any instruction that references the DPTR
(ex. MOVX A, @ DPTR) refers to the active data pointer as determined by the SEL bit. Since the bit
adjacent to SEL in the DPS register is not used, the fastest means of changing the SEL (and thereby
changing the active data pointer) is with an INC instruction. Each INC DPS Instruction will toggle the
active data pointer.
Unlike the standard 8051, the DS87C550 has the ability to decrement as well as increment the data
pointers without additional instructions. When the INC DPTR instruction is executed, the active DPTR is
incremented or decremented according to the ID1, ID0 (DPS.7-6), and SEL (DPS.0) bits as shown. The
inactive DPTR is not affected.
ID1
ID0
SEL
RESULT OF INC DPTR
X
0
INCREMENT DPTR0
X
1
0
DECREMENT DPTR0
0
X
1
INCREMENT DPTR1
1
X
1
DECREMENT DPTR1
相關(guān)PDF資料
PDF描述
MC908LK24CPBE IC MCU 8BIT 64-LQFP
1588908-1 JR FRRL KIT, PC 126 SEALED
1278530-1 RETAINING CLIP, 1X4 BACKPLANE
1544551-1 CONNECTOR 5V 6.35
492578-1 DUST COVER,DAUGHTER CARD HSG
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS88 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Analog IC
DS8800 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Dual Voltage Level Translator
DS8800H 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Dual Voltage Level Translator
DS8800H/A+ 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:TTL-to-MOS Translator
DS8802J/A+ 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:MOS-to-TTL Translator
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠(chǎng)商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*