mc68hc05l28 Freescale Semiconductor, Inc, mc68hc05l28 Datasheet - Page 21

• Manufacturer Part Number: mc68hc05l28
• Description: ?exible General-purpose Microcomputer
• Manufacturer: Freescale Semiconductor, Inc

1.2
There is only one mask option on the MC68HC05L28. This is to enable or disable the STOP
instruction. It is programmed during manufacture and must be specified on the order form.
1.2.1
In addition to its mask option, the MC68HC05L28 also has two functions that are programmable
via an options register (OPT). This register can be written to once after a reset, but it can be read
at any time.
IRQED — IRQ edge sensitivity
This bit selects the IRQ0 sensitivity.
Reset clears this bit.
COPON — COP function enable/disable
Reset clears this bit.
MC68HC05L28
Option register (OPT)
1 (set)
0 (clear) –
1 (set)
0 (clear) –
Mask options on the MC68HC05L28
Option register (OPT)
–
–
The IRQ0 is edge-sensitive.
The IRQ0 is edge-and-level-sensitive.
This bit enables the COP watchdog.
This bit disables the operation of the COP.
Address
$001D
bit 7
INTRODUCTION
bit 6
bit 5
bit 4
bit 3
bit 2
IRQED COPON ???? ?100
bit 1
bit 0
MOTOROLA
on reset
State
TPG
1-3
1