MC68HC705C Motorola, MC68HC705C Datasheet - Page 21

• Manufacturer Part Number: MC68HC705C
• Description: HCMOS Microcontroller Unit
• Manufacturer: Motorola

1.4 Programmable Options
MC68HC705C8A — Rev. 2.0
MOTOROLA
NOTE:
Address:
A line over a signal name indicates an active low signal. For example,
RESET is active high and RESET is active low. Any reference to voltage,
current, or frequency specified in this document will refer to the nominal
values. The exact values and their tolerance or limits are specified in
Section 13. Electrical
These options are programmable in the mask option registers:
These options are programmable in the option register (see
1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or
Reset:
Read:
Write:
copying the PROM difficult for unauthorized users.
•
•
•
•
•
•
•
Software-programmable external interrupt sensitivity
Bidirectional RESET pin
Enabling of port B pullup devices (see
Register
Enabling of non-programmable COP watchdog (see
Option Register
One of four selectable memory configurations
Programmable read-only memory (PROM) security
External interrupt sensitivity
*
Implemented as an EPROM cell
$1FDF
RAM0
Bit 7
0
= Unimplemented
Figure 1-1. Option Register (Option)
General Description
1)
RAM1
6
0
Specifications.
2)
5
0
0
4
0
0
U = Unaffected
SEC
3
*
*
9.5.2 Mask Option
U
2
Programmable Options
General Description
1
IRQ
1
1
9.5.3 Mask
Technical Data
Figure
Bit 0
1-1):
0
0
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