mc68hc11d0 Freescale Semiconductor, Inc, mc68hc11d0 Datasheet - Page 52

• Manufacturer Part Number: mc68hc11d0
• Description: Mc68hc11d0 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

PSEL[3:0] — Priority Select Bits
5.4 Interrupts
5-8
The IRVNE control bit allows internal read accesses to be available on the external
data bus during factory testing or emulation. Refer to SECTION 4 OPERATING
MODES AND ON-CHIP MEMORY for more information.
These bits select one interrupt source to be elevated above all other I-bit-related
sources and can be written to only while the I bit in the CCR is set (interrupts disabled).
The MCU has 18 interrupt vectors that support 22 interrupt sources. The 19 maskable
interrupts are generated by on-chip peripheral systems. These interrupts are recog-
nized when the global interrupt mask bit (I) in the condition code register (CCR) is
clear. The three non-maskable interrupt sources are illegal opcode trap, software in-
terrupt, and XIRQ pin. Refer to Table 5-4, which shows the interrupt sources and vec-
tor assignments for each source.
Table 5-3 Highest Priority Interrupt Selection
Freescale Semiconductor, Inc.
PSEL[3:0]
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
For More Information On This Product,
RESETS AND INTERRUPTS
Go to: www.freescale.com
Timer Overflow
Pulse Accumulator Overflow
Pulse Accumulator Input Edge
SPI Serial Transfer Complete
SCI Serial System
Reserved (Default to IRQ)
IRQ (External Pin)
Real-Time Interrupt
Timer Input Capture 1
Timer Input Capture 2
Timer Input Capture 3
Timer Output Compare 1
Timer Output Compare 2
Timer Output Compare 3
Timer Output Compare 4
Timer Input Capture 4/Output Compare 5
Interrupt Source Promoted
TECHNICAL DATA