
Memory
Data Sheet
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 4.0
28
Memory
MOTOROLA
EPMSEC — EPROM Security Bit
The EPMSEC bit controls access to the EPROM/OTPROM.
1 = External access to EPROM/OTPROM denied
0 = External access to EPROM/OTPROM not denied
OSCRES — Oscillator Internal Resistor Bit
The OSCRES bit enables a 2-M
internal resistor in the oscillator circuit.
1 = Oscillator internal resistor enabled
0 = Oscillator internal resistor disabled
NOTE:
Program the OSCRES bit to logic 0 in devices using low-speed crystal or RC
oscillators with external resistor.
SWAIT — Stop-to-Wait Conversion Bit
The SWAIT bit enables halt mode. When the SWAIT bit is set, the CPU
interprets the STOP instruction as a WAIT instruction, and the MCU enters halt
mode. Halt mode is the same as wait mode, except that an oscillator
stabilization delay of 1 to 4064 tcyc occurs after exiting halt mode.
1 = Halt mode enabled
0 = Halt mode not enabled
SWPDI — Software Pulldown Inhibit Bit
The SWPDI bit inhibits software control of the I/O port pulldown devices. The
SWPDI bit overrides the pulldown inhibit bits in the port pulldown inhibit
registers.
1 = Software pulldown control inhibited
0 = Software pulldown control not inhibited
PIRQ — Port A External Interrupt Bit
The PIRQ bit enables the PA0–PA3 pins to function as external interrupt pins.
1 = PA0–PA3 enabled as external interrupt pins
0 = PA0–PA3 not enabled as external interrupt pins
LEVEL —External Interrupt Sensitivity Bit
The LEVEL bit controls external interrupt triggering sensitivity.
1 = External interrupts triggered by active edges and active levels
0 = External interrupts triggered only by active edges
COPEN — COP Enable Bit
The COPEN bit enables the COP watchdog.
1 = COP watchdog enabled
0 = COP watchdog disabled