MC68HC05RC17 Datasheet, PDF (30/128 Pages) Freescale Semiconductor, Inc – General Release Specification

Memory
Freescale Semiconductor, Inc.
Addr
Register Name
Bit 7
6
5
4
3
2
1
Bit 0
$18
Reserved R
R
R
R
R
R
R
R
$19
Reserved R
R
R
R
R
R
R
R
$1A
Reserved R
R
R
R
R
R
R
R
$1B
Reserved R
R
R
R
R
R
R
R
$1C
Reserved R
R
R
R
R
R
R
R
$1D
Reserved R
R
R
R
R
R
R
R
$1E
Reserved R
R
R
R
R
R
R
R
$1F
Reserved R
R
R
R
R
R
R
R
2.3.1 ROM
R = Reserved
Figure 2-2. I/O Registers (Sheet 2 of 2)
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 MC68HC05RC17 to prevent
external viewing of the ROM contents. This feature helps ensure 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
MC68HC05RC17 — Rev. 2.0
Memory
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