參數(shù)資料
型號(hào)： MC68HC05C9EP
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝： PLASTIC, DIP-40
文件頁數(shù)： 60/144頁
文件大?。?/td> 1628K
代理商： MC68HC05C9EP
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General Description
Advance Information
MC68HC05C9E
22
General Description
MOTOROLA
1.5 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
Address:
$3FDF
Bit 7
6
54321
Bit 0
Read:
RAM0
RAM1
0000
IRQ
0
Write:
Reset:
00
000010
= Unimplemented
Figure 1-2. Option Register
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