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| 型號： | MC68HC2681FN |
| 廠商： | FREESCALE SEMICONDUCTOR 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, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 68/88頁 |
| 文件大小： | 726K |
| 代理商： | MC68HC2681FN |
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MOTOROLA
MC68HC681 USER’S MANUAL
A-1
A
APPENDIX A
MC68HC2681
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 below.
A.1 INTRODUCTION
Unlike the MC68HC681, which has an M68000 bus interface, the MC68HC2681 has a
general-purpose interface that can be used with both synchronous and asynchronous
microprocessors. The device has a multipurpose 7-bit input port and a multipurpose 8-bit
output port. These ports can be used as general-purpose I/O ports or can be assigned
specific functions (such as clock inputs or status/interrupt outputs) under program control.
Figure A-1 is a block diagram for the MC68HC2681.
A.1.1 Interrupt Control Logic
The internal operation of interrupt events and registers is identical to the MC68HC681;
however, the MH68HC2681 does not have an IACK pin, and therefore does not support
Interrupt Acknowledge bus cycles. The IVR can be written and read but cannot be used to
vector the CPU to an interrupt service routine.
A.1.2 Input Port
The MC68HC2681 input port pins and associated registers are identical to those of the
MC68HC681, with the exception of an extra pin (IP6) and the Channel B Receiver Clock
Select programming (CSRB(7-4)).
A.2 SIGNAL DESCRIPTION
Table A-1, like that for the MC68HC681 found in Section 2 Signal Descriptions, provides
a quick reference in determining a signal’s pin number, its use as an input or output, whether
it is active high or low, and the section containing more information about its operation. The
signal description given for the MC68HC681 applies to the MC68HC2681 except for the
areas described in this appendix.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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