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Chapter 1 MC9S12Q Device Overview (MC9S12Q128-Family)
62
MC9S12Q128
Freescale Semiconductor
Rev 1.10
1.6.2
Resets
Resets are a subset of the interrupts featured in
Table 1-9. The different sources capable of generating a
system reset are summarized in
Table 1-10. When a reset occurs, MCU registers and control bits are
changed to known start-up states. Refer to the respective module Block User Guides for register reset
states.
1.6.2.1
Reset Summary Table
1.6.2.2
Effects of Reset
When a reset occurs, MCU registers and control bits are changed to known start-up states. Refer to the
respective module Block User Guides for register reset states. Refer to the HCS12 Multiplexed External
Bus Interface (MEBI) Block Guide for mode dependent pin conguration of port A, B and E out of reset.
Refer to the PIM Block User Guide for reset congurations of all peripheral module ports.
mode after reset.
The RAM array is not automatically initialized out of reset.
NOTE
For devices assembled in 48-pin or 52-pin LQFP packages all non-bonded
out pins should be congured as outputs after reset in order to avoid current
drawn from oating inputs. Refer to
Table 1-5 for affected pins.
1.7
Device Specic Information and Module Dependencies
1.7.1
PPAGE
External paging is not supported on these devices. In order to access the 16K ash blocks in the address
range 0x8000–0xBFFF the PPAGE register must be loaded with the corresponding value for this range.
Refer to
Table 1-11 for device specic page mapping.
For all devices Flash Page 3F is visible in the 0xC000–0xFFFF range if ROMON is set. For all devices
(except MC9S12GC16) Page 3E is also visible in the 0x4000–0x7FFF range if ROMHM is cleared and
ROMON is set. For all devices apart from MC9S12Q32 Flash Page 3D is visible in the 0x0000–0x3FFF
range if ROMON is set...
Table 1-10. Reset Summary
Reset
Priority
Source
Vector
Power-on Reset
1
CRG module
0xFFFE, 0xFFFF
External Reset
1
RESET pin
0xFFFE, 0xFFFF
Low Voltage Reset
1
VREG module
0xFFFE, 0xFFFF
Clock Monitor Reset
2
CRG module
0xFFFC, 0xFFFD
COP Watchdog Reset
3
CRG module
0xFFFA, 0xFFFB