參數(shù)資料
型號(hào)： MC68HC681P
廠商： MOTOROLA INC
元件分類： 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)： 45/88頁(yè)
文件大?。?/td> 461K
代理商： MC68HC681P
TABLE OF CONTENTS (Continued)
Paragraph
Page
Number
Title
Number
vi
MC68HC681 USER’S MANUAL
MOTOROLA
2.15.5
OP4 ............................................................................................ 2-6
2.15.6
OP5 ............................................................................................ 2-6
2.15.7
OP6 ............................................................................................ 2-6
2.15.8
OP7 ............................................................................................ 2-6
Section 3
Operation
3.1
Transmitter ........................................................................................... 3-1
3.2
Receiver ............................................................................................... 3-2
3.3
Looping Modes..................................................................................... 3-4
3.3.1
Automatic-Echo Mode................................................................ 3-5
3.3.2
Local-Loopback Mode................................................................ 3-5
3.3.3
Remote-Loopback Mode............................................................ 3-5
3.4
Multidrop Mode .................................................................................... 3-5
3.5
Counter/Timer ...................................................................................... 3-6
3.5.1
Counter Mode ............................................................................ 3-6
3.5.2
Timer Mode ................................................................................ 3-7
Section 4
Programming and Register Descriptions
4.1
Programming Descriptions................................................................... 4-1
4.2
Register Bit Formats ............................................................................ 4-6
4.3
Register Description........................................................................... 4-13
4.3.1
Channel A Mode Register 1 (MR1A)........................................ 4-13
4.3.1.1
Channel A Receiver Ready-To-Receive
Control — MR1A[7]. ..................................................... 4-13
4.3.1.2
Channel A Receiver-Interrupt Select - MR1A[6]........... 4-13
4.3.1.3
Channel A Error Mode Select - MR1A[5]...................... 4-13
4.3.1.4
Channel A Parity Mode Select - MR1A[4:3]. ................ 4-13
4.3.1.5
Channel A Parity Type Select - MR1A[2]. .................... 4-13
4.3.1.6
Channel A Bits-Per-Character Select - MR1A[1:0]........ 4-13
4.3.2
Channel A Mode Register 2 (MR2A)........................................ 4-14
4.3.2.1
Channel A Mode Select - MR2A[7:6]............................ 4-14
4.3.2.2
Channel A Transmitter Request-to-Send
Control - MR2A[5]. ........................................................ 4-15
4.3.2.3
Channel A Clear-to-Send Control - MR2A[4]................ 4-16
4.3.2.4
Channel A Stop Bit Length Select - MR2A[3:2]. ........... 4-16
4.3.3
Channel B Mode Register 1 (MR1B)........................................ 4-16
4.3.4
Channel B Mode Register 2 (MR2B)........................................ 4-16
4.3.5
Channel A Clock-Select Register (CSRA) ............................... 4-16
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