參數(shù)資料
型號(hào): MC68HC05RC18DW
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, PDSO28
封裝: SOIC-28
文件頁數(shù): 51/124頁
文件大?。?/td> 457K
代理商: MC68HC05RC18DW
NON-DISCLOSURE
AGREEMENT
REQUIRED
Memory
General Release Specification
MC68HC05RC18 Rev. 2.0
32
Memory
MOTOROLA
2.3.1 ROM
The user ROM consists of 15,920 bytes of ROM located from $0180 to
$3FAF and 16 bytes of user vectors located from $3FF0 to $3FFF.
The burn-in ROM is located from $3FB0 to $3FEF.
Ten of the user vectors, $3FF6 through $3FFF, are dedicated to reset
and interrupt vectors. The six remaining locations — $3FF0, $3FF1,
$3FF2, $3FF3, $3FF4, and $3FF5 — are general-purpose user ROM
locations.
2.3.2 ROM Security
Security has been incorporated into the MC68HC05RC18 to help
prevent external viewing of the ROM contents. By having unique data
values at locations $2000–$2008, customers can help ensure that their
software remains proprietary.1
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the ROM difficult for unauthorized users.
$17
Modulator Data Register 3 (MDR3)
SB7
SB6
SB5
SB4
SB3
SB2
SB1
SB0
$18
Reserved
RRRRRRRR
$19
Reserved
RRRRRRRR
$1A
Reserved
RRRRRRRR
$1B
Reserved
RRRRRRRR
$1C
Reserved
RRRRRRRR
$1D
Reserved
RRRRRRRR
$1E
Reserved
RRRRRRRR
R
= Reserved
Addr
Register Name
Bit 7
654321
Bit 0
Figure 2-2. I/O Registers (Continued)
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