mc68hc705c4acfn Freescale Semiconductor, Inc, mc68hc705c4acfn Datasheet - Page 112

• Manufacturer Part Number: mc68hc705c4acfn
• Description: M68hc05 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

EPROM/OTPROM (PROM)
9.5 Control Registers
9.5.1 Option Register
Technical Data
112
Address:
This subsection describes three registers that control:
The option register (option) shown in
IRQ sensitivity, enable the PROM security, and select the memory
configuration.
SEC — Security Bit
Reset:
Read:
Write:
•
•
•
•
•
This bit is implemented as an EPROM cell and is not affected by
reset.
1 = Security enabled.
0 = Security off; bootloader able to be enabled
Memory configuration
PROM security
IRQ edge or level sensitivity
Port B pullups
Non-programmable computer operating properly (COP) watchdog
timer enable/disable
*
Implemented as an EPROM cell
$1FDF
Bit 7
0
0
EPROM/OTPROM (PROM)
= Unimplemented
Figure 9-4. Option Register (Option)
6
0
0
5
0
0
MC68HC705C4A • MC68HSC705C4A — Rev. 3.0
4
0
0
Figure 9-4
U = Unaffected
SEC
3
*
*
is used to select the
U
2
IRQ
1
1
MOTOROLA
Bit 0
0
0