參數(shù)資料
型號(hào)： MC68HC681P
廠商： MOTOROLA INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁(yè)數(shù)： 4/88頁(yè)
文件大?。?/td> 461K
代理商： MC68HC681P
MOTOROLA
MC68HC681 USER’S MANUAL
1-1
1
SECTION 1
INTRODUCTION
The MC68HC681 dual universal asynchronous receiver/transmitter (DUART) is part of the
M68000 Family of peripherals and directly interfaces to the MC68000 processor via an
asynchronous bus structure. The MC68HC681 consists of these major sections:
Internal Control Logic
Timing Logic
Interrupt Control Logic
Bidirectional 8-bit Data Bus Buffer
Two Independent Communication Channels (A and B)
6-bit Parallel Input Port
8-bit Parallel Output Port
The MC68HC2681 dual asynchronous receiver/transmitter (DUART) is functionally
equivalent to the MC68HC681 with some minor differences. The description of the
MC68HC681 applies to the MC68HC2681 except for the areas described in Appendix A
MC68HC2681 located in the back of this document.
Figure 1-1 is a basic block diagram of the MC68HC681 and should be referred to during the
discussion of its features, which include the following:
M68000 Bus Compatible
Two Independent Full-Duplex Asynchronous Receiver/Transmitter Channels
Maximum Data Transfer Rate:
— 1X — 1 Mbits/second
— 16X — 250 kbits/second
Quadruple-Buffered Receiver Data Registers
Double-Buffered Transmitter Data Registers
Independently Programmable Baud Rate for Each Receiver and Transmitter Selectable
From:
— 18 Fixed Rates: 50 to 38.4k Baud
— One User Defined Rate Derived from a Programmable Timer/Counter
— External 1X Clock or 16X Clock
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