MC68HC705C View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
MFG CO.
'MC68HC705C' PDF : 210 Pages View PDF
General Description
Programmable Options
1.4 Programmable Options
These options are programmable in the mask option registers:
• Enabling of port B pullup devices (see 9.5.2 Mask Option
Register 1)
• Enabling of non-programmable COP watchdog (see 9.5.3 Mask
Option Register 2)
These options are programmable in the option register (shown in
Figure 1-1):
• PROM security(1)
• External interrupt sensitivity
Address: $1FDF
Bit 7
6
5
4
3
2
1
Bit 0
Read:
0
0
0
0
SEC*
Write:
IRQ
0
Reset: 0
0
0
0
*
U
1
0
= Unimplemented
U = Unaffected
*Implemented as an EPROM cell
Figure 1-1. Option Register (Option)
SEC — Security Bit
This bit is implemented as an EPROM cell and is not affected by
reset.
1 = Bootloader disabled; MCU operates only in single-chip mode.
0 = Security off; bootloader can be enabled.
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
copying the PROM difficult for unauthorized users.
MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
MOTOROLA
General Description
Technical Data
23
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