參數(shù)資料
型號： NSC800N
廠商： National Semiconductor Corporation
英文描述： NSC800TM High-Performance Low-Power CMOS Microprocessor
中文描述： NSC800TM高性能低功耗CMOS微處理器
文件頁數(shù)： 16/76頁
文件大?。?/td> 785K
代理商： NSC800N
9.0 Timing and Control
(Continued)
9.2 CPU TIMING
The NSC800 uses a multiplexed bus for data and address-
es. The 16-bit address bus is divided into a high-order 8-bit
address bus that handles bits 8–15 of the address, and a
low-order 8-bit multiplexed address/data bus that handles
bits 0–7 of the address and bits 0–7 of the data. Strobe
outputs from the NSC800 (ALE, RD and WR) indicate when
a valid address or data is present on the bus. IO/M indi-
cates whether the ensuing cycle accesses memory or I/O.
During an input or output instruction, the CPU duplicates the
lower half of the address
[
AD(0–7)
]
onto the upper address
bus
[
A(8–15)
]
. The eight bits of address will stay on A(8–
15) for the entire machine cycle and can be used for chip
selection directly.
Figure 9 illustrates the timing relationship for opcode fetch
cycles with and without a wait state.
TL/C/5171–15
FIGURE 9a. Opcode Fetch Cycles without WAIT States
TL/C/5171–16
FIGURE 9b. Opcode Fetch Cycles with WAIT States
16
相關(guān)PDF資料
PDF描述
NSC800V NSC800TM High-Performance Low-Power CMOS Microprocessor
NSC858 NSC858 Universal Asynchronous Receiver/Transmitter
NSC858D NSC858 Universal Asynchronous Receiver/Transmitter
NSC858E NSC858 Universal Asynchronous Receiver/Transmitter
NSC858N NSC858 Universal Asynchronous Receiver/Transmitter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NSC800N/A+ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor
NSC800N/B+ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor
NSC800N-1 制造商:Texas Instruments 功能描述:
NSC800N-1/A+ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor
NSC800N-1/B+ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microprocessor
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