
Resets and Interrupts
Reset and Interrupt Priority
M68HC11E Family — Rev. 5
Data Sheet
MOTOROLA
Resets and Interrupts
97
5.4.1  Highest Priority Interrupt and Miscellaneous Register 
RBOOT — Read Bootstrap ROM Bit
Has meaning only when the SMOD bit is a 1 (bootstrap mode or special test 
mode). At all other times this bit is clear and cannot be written. Refer to 
Section 
2. Operating Modes and On-Chip Memory
 for more information. 
SMOD — Special Mode Select Bit
This bit reflects the inverse of the MODB input pin at the rising edge of reset. 
Refer to 
Section 2. Operating Modes and On-Chip Memory
 for more 
information. 
MDA — Mode Select A Bit
The mode select A bit reflects the status of the MODA input pin at the rising 
edge of reset. Refer to 
Section 2. Operating Modes and On-Chip Memory
 for 
more information. 
IRVNE — Internal Read Visibility/Not E Bit
The IRVNE control bit allows internal read accesses to be available on the 
external data bus during operation in expanded modes. In single-chip and 
bootstrap modes, IRVNE determines whether the E clock is driven out an 
external pin. For the MC68HC811E2, this bit is IRV and only controls internal 
read visibility. Refer to 
Section 2. Operating Modes and On-Chip Memory
 for 
more information. 
PSEL[3:0] — Priority Select Bits 
These bits select one interrupt source to be elevated above all other I-bit-related 
sources and can be written only while the I bit in the CCR is set (interrupts 
disabled). 
Address:
$103C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
RBOOT
(1)
SMOD
(1)
MDA
(1)
IRVNE
PSEL2
PSEL2
PSEL1
PSEL0
Write:
Reset:
Single chip:
0
0
0
0
0
1
1
0
Expanded:
0
0
1
0
0
1
1
0
Bootstrap:
1
1
0
0
0
1
1
0
Special test:
1. The values of the RBOOT, SMOD, and MDA reset bits depend on the mode selected at the
RESET pin rising edge. Refer to 
Table 2-1. Hardware Mode Select Summary
.
0
1
1
1
0
1
1
0
Figure 5-4. Highest Priority I-Bit Interrupt
and Miscellaneous Register (HPRIO)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
  Go to: www.freescale.com
n
.