MC68HC05RC8 Datasheet, PDF (30/122 Pages) Freescale Semiconductor, Inc – General Release Specification

Memory
Freescale Semiconductor, Inc.
Addr.
$001A
$001B
$001C
$001D
$001E
$001F
Register
Bit 7
6
5
4
3
2
1
Bit 0
Reserved R
R
R
R
R
R
R
R
Reserved R
R
R
R
R
R
R
R
Reserved R
R
R
R
R
R
R
R
Reserved R
R
R
R
R
R
R
R
Reserved R
R
R
R
R
R
R
R
Reserved R
R
R
R
R
R
R
R
R = Reserved
Figure 2-2. I/O Registers (Continued)
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–$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 MC68HC05RC16 to prevent
external viewing of the ROM contents. This feature ensures that
customer-developed 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.
General Release Specification
MC68HC05RC16 — Rev. 3.0
Memory
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