mc9s08jm60 Freescale Semiconductor, Inc, mc9s08jm60 Datasheet - Page 65
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mc9s08jm60
Manufacturer Part Number
mc9s08jm60
Description
Hcs08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08JM60.pdf
(386 pages)
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Chapter 5
Resets, Interrupts, and System Configuration
5.1
This chapter discusses basic reset and interrupt mechanisms and the various sources of reset and interrupts
in the MC9S08JM60 series. Some interrupt sources from peripheral modules are discussed in greater detail
within other chapters of this data manual. This chapter gathers basic information about all reset and
interrupt sources in one place for easy reference. A few reset and interrupt sources, including the computer
operating properly (COP) watchdog, are not part of on-chip peripheral systems with their own sections but
are part of the system control logic.
5.2
Reset and interrupt features include:
5.3
Resetting the MCU provides a way to start processing from a known set of initial conditions. During reset,
most control and status registers are forced to initial values and the program counter is loaded from the
reset vector (0xFFFE:0xFFFF). On-chip peripheral modules are disabled and I/O pins are initially
configured as general-purpose high-impedance inputs with pullup devices disabled. The I bit in the
condition code register (CCR) is set to block maskable interrupts so the user program has a chance to
initialize the stack pointer (SP) and system control settings. SP is forced to 0x00FF at reset.
The MC9S08JM60 series has seven sources for reset:
Freescale Semiconductor
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Multiple sources of reset for flexible system configuration and reliable operation
Reset status register (SRS) to indicate source of most recent reset
Separate interrupt vectors for each module (reduces polling overhead) (see
Power-on reset (POR)
Low-voltage detect (LVD)
Computer operating properly (COP) timer
Illegal opcode detect (ILOP)
Background debug forced reset
External reset pin (RESET)
Clock generator loss of lock and loss of clock reset (LOC)
Introduction
Features
MCU Reset
MC9S08JM60 Series Data Sheet, Rev. 2
Table
5-1)
65
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