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| 型號(hào)： | MC68HC05C9AMFN |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 32/124頁(yè) |
| 文件大?。?/td> | 774K |
| 代理商： | MC68HC05C9AMFN |
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Software-Programmable Options
MC68HC05C9A Advance Information Data Sheet, Rev. 5.1
Freescale Semiconductor
15
1.4 Software-Programmable Options
The option register (OR), shown in Figure 1-2, contains the programmable bits for these 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 Bit
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
1.5 Functional Pin Descriptions
Figure 1-3, Figure 1-4, Figure 1-5, and Figure 1-6 show the pin assignments for the available packages.
A functional description of the pins follows.
NOTE
A line over a signal name indicates an active low signal. For example,
RESET is active high and RESET is active low.
Address:
$3FDF
Bit 7
654321
Bit 0
Read:
RAM0
RAM1
0000
IRQ
0
Write:
Reset:
00000010
= Unimplemented
Figure 1-2. Option Register
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05C9AMP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9AP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9CP | 制造商:Motorola Inc 功能描述:IC UP HCMOS 68HC05C9CP DIP40 0 |
| MC68HC05C9E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
| MC68HC05C9ECFB | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers |
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