MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 142

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

HPRIO — Highest Priority I Interrupt
Resets and Interrupts
10.7 Interrupt test registers
Technical Data
142
RESET:
Bit 7
1
1
PSEL6
6
1
DLY — Enable Oscillator Start-up Delay on Exit from STOP
Write only if I mask in CCR = 1 (interrupts inhibited). Read anytime.
To give a maskable interrupt source highest priority, write the low byte of
the vector address to the HPRIO register. For example, writing $F0 to
HPRIO would assign highest maskable interrupt priority to the real-time
interrupt timer ($FFF0). If an un-implemented vector address or a non-I-
masked vector address (value higher than $F2) is written, then IRQ will
be the default highest priority interrupt.
These registers are used in special modes for testing the interrupt logic
and priority without needing to know which modules and what functions
are used to generate the interrupts.Each bit is used to force a specific
interrupt vector by writing it to 1.Bits are named with B6 through F4 to
indicate vectors $FFB6 through $FFF4. These bits are also used in
special modes to view that an interrupt caused by a module has reached
the interrupt module.
IRQEN can be read and written anytime in all modes.
The delay time of about 4096 cycles is based on the XCLK rate
chosen.
DLY can be read anytime and written once in normal modes. In
special modes, DLY can be read and written anytime.
0 = No stabilization delay imposed on exit from STOP mode. A
1 = Stabilization delay is imposed before processing resumes after
PSEL5
5
1
stable external oscillator must be supplied.
STOP.
Resets and Interrupts
PSEL4
4
1
PSEL3
3
0
PSEL2
2
0
MC68HC912DT128A — Rev 4.0
PSEL1
1
1
Bit 0
0
0
MOTOROLA
$001F