MC68HC681FN 查看數據表（PDF） - Motorola => Freescale
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MC68HC681FN Datasheet PDF : 88 Pages
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TABLE OF CONTENTS (Continued)
Paragraph
Number
2.15.5
2.15.6
2.15.7
2.15.8
Title
Page
Number
OP4 ............................................................................................ 2-6
OP5 ............................................................................................ 2-6
OP6 ............................................................................................ 2-6
OP7 ............................................................................................ 2-6
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
3.4
3.5
3.5.1
3.5.2
Section 3
Operation
Transmitter ........................................................................................... 3-1
Receiver ............................................................................................... 3-2
Looping Modes..................................................................................... 3-4
Automatic-Echo Mode................................................................ 3-5
Local-Loopback Mode................................................................ 3-5
Remote-Loopback Mode............................................................ 3-5
Multidrop Mode .................................................................................... 3-5
Counter/Timer ...................................................................................... 3-6
Counter Mode ............................................................................ 3-6
Timer Mode ................................................................................ 3-7
4.1
4.2
4.3
4.3.1
4.3.1.1
4.3.1.2
4.3.1.3
4.3.1.4
4.3.1.5
4.3.1.6
4.3.2
4.3.2.1
4.3.2.2
4.3.2.3
4.3.2.4
4.3.3
4.3.4
4.3.5
Section 4
Programming and Register Descriptions
Programming Descriptions................................................................... 4-1
Register Bit Formats ............................................................................ 4-6
Register Description........................................................................... 4-13
Channel A Mode Register 1 (MR1A)........................................ 4-13
Channel A Receiver Ready-To-Receive
Control — MR1A[7]. ..................................................... 4-13
Channel A Receiver-Interrupt Select - MR1A[6]........... 4-13
Channel A Error Mode Select - MR1A[5]...................... 4-13
Channel A Parity Mode Select - MR1A[4:3]. ................ 4-13
Channel A Parity Type Select - MR1A[2]. .................... 4-13
Channel A Bits-Per-Character Select - MR1A[1:0]........ 4-13
Channel A Mode Register 2 (MR2A)........................................ 4-14
Channel A Mode Select - MR2A[7:6]............................ 4-14
Channel A Transmitter Request-to-Send
Control - MR2A[5]. ........................................................ 4-15
Channel A Clear-to-Send Control - MR2A[4]................ 4-16
Channel A Stop Bit Length Select - MR2A[3:2]. ........... 4-16
Channel B Mode Register 1 (MR1B)........................................ 4-16
Channel B Mode Register 2 (MR2B)........................................ 4-16
Channel A Clock-Select Register (CSRA) ............................... 4-16
vi
MC68HC681 USER’S MANUAL
MOTOROLA
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