参数资料
型号: MC68HC05RC18FN
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 53/126页
文件大小: 1180K
代理商: MC68HC05RC18FN
NON-DISCLOSURE
AGREEMENT
REQUIRED
Memory
General Release Specification
MC68HC05RC18 Rev. 2.1
32
Memory
Freescale Semiconductor
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
$17
Modulator Data Register 3 (MDR3)
SB7
SB6
SB5
SB4
SB3
SB2
SB1
SB0
$18
Reserved
R
RRRRRR
R
$19
Reserved
R
RRRRRR
R
$1A
Reserved
R
RRRRRR
R
$1B
Reserved
R
RRRRRR
R
$1C
Reserved
R
RRRRRR
R
$1D
Reserved
R
RRRRRR
R
$1E
Reserved
R
RRRRRR
R
R= Reserved
Addr
Register Name
Bit 7
6
5
4321
Bit 0
Figure 2-2. I/O Registers (Continued)
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or
copying the ROM difficult for unauthorized users.
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