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參數資料
型號: MC68HCL05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 20/160頁
文件大小: 783K
代理商: MC68HCL05C9A
L
G
R
General Description
General Release Specification
MC68HC05C9A
Rev. 4.0
20
General Description
MOTOROLA
1.5 Software-Programmable Options
The option register (OR), shown in
Figure 1-2
, contains the
programmable bits for the following options:
Map two different areas of memory between RAM and ROM, one
of 48 bytes and one of 128 bytes
Edge-triggered only or edge- and level-triggered external interrupt
(IRQ pin and any port B pin configured for interrupt)
This register must be written to by user software during operation of the
microcontroller.
RAM0 — Random Access Memory Control Bit 0
This read/write bit selects between RAM or ROM in location $0020 to
$004F. This bit can be read or written at any time.
1 = RAM selected
0 = ROM selected
RAM1— Random Access Memory Control Bit 1
This read/write bit selects between RAM or ROM in location $0100 to
$017F. This bit can be read or written at any time.
1 = RAM selected
0 = EPROM selected
IRQ — Interrupt Request
This bit selects between an edge-triggered only or edge- and level-
triggered external interrupt. This bit is set by reset, but can be cleared
by software. This bit can be written only once.
1 = Edge and level interrupt option selected
0 = Edge-only interrupt option selected
$3FDF
Bit 7
6
5
4
3
2
1
Bit 0
Read:
RAM0
RAM1
0
0
0
0
IRQ
0
Write:
Reset:
0
0
0
0
0
0
1
0
= Unimplemented
Figure 1-2. Option Register
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相關代理商/技術參數
參數描述
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