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AM186ED-20KC/W 데이터시트(PDF) 38 Page - Advanced Micro Devices

부품명 AM186ED-20KC/W
상세설명  High Performance, 80C186- and 80C188-Compatible, 16-Bit Embedded Microcontrollers
PDF  88 Pages
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM186ED-20KC/W 데이터시트(HTML) 38 Page - Advanced Micro Devices

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38
Am186ED/EDLV Microcontrollers
PRELI M INARY
D
RA
F T
PERIPHERAL CONTROL BLOCK
The integrated peripherals of the Am186ED/EDLV mi-
crocontrollers are controlled by 16-bit read/write regis-
ters. The peripheral registers are contained within an
internal 256-byte peripheral control block (PCB). The
registers are physically located in the peripheral de-
vices they control, but they are addressed as a single
256-byte block. Table 8 shows a map of these regis-
ters.
Reading and Writing the PCB
Code written for the Am186ED/EDLV microcontrollers
should perform all writes to the PCB registers as byte
writes. These writes transfer 16 bits of data to the PCB
register even if an 8-bit register is named in the instruc-
tion. For example, out dx, al results in the value of
ax
being written to the port address in dx. Reads to the
PCB should be done as word reads. Code written in
this manner runs correctly on the Am186ED/EDLV mi-
crocontrollers with the PCB overlayed on either 8- or
16-bit address spaces.
Unaligned reads and writes to the PCB result in unpre-
dictable behavior.
For a complete description of all the registers in the
PCB, see the
Am186ED/EDLV Microcontrollers User’s
Manual, order# 21335A.



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