MC68HC711E9FU

Manufacturer Part NumberMC68HC711E9FU
ManufacturerFreescale Semiconductor
MC68HC711E9FU datasheet
 

Specifications of MC68HC711E9FU

Cpu FamilyHC11Device Core Size8b
Frequency (max)4MHzInterface TypeSCI/SPI
Program Memory TypeEPROMProgram Memory Size12KB
Total Internal Ram Size512Byte# I/os (max)38
Number Of Timers - General Purpose8Operating Supply Voltage (typ)3.3/5V
Operating Supply Voltage (max)5.5VOperating Supply Voltage (min)3V
On-chip Adc8-chx8-bitInstruction Set ArchitectureCISC
Operating Temp Range0C to 70COperating Temperature ClassificationCommercial
MountingSurface MountPin Count64
Package TypePQFPLead Free Status / Rohs StatusNot Compliant
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Chapter 5
Resets and Interrupts
5.1 Introduction
Resets and interrupt operations load the program counter with a vector that points to a new location from
which instructions are to be fetched. A reset immediately stops execution of the current instruction and
forces the program counter to a known starting address. Internal registers and control bits are initialized
so the MCU can resume executing instructions. An interrupt temporarily suspends normal program
execution while an interrupt service routine is being executed. After an interrupt has been serviced, the
main program resumes as if there had been no interruption.
5.2 Resets
The four possible sources of reset are:
Power-on reset (POR)
External reset (RESET)
Computer operating properly (COP) reset
Clock monitor reset
POR and RESET share the normal reset vector. COP reset and the clock monitor reset each has its own
vector.
5.2.1 Power-On Reset (POR)
A positive transition on V
generates a power-on reset (POR), which is used only for power-up
DD
conditions. POR cannot be used to detect drops in power supply voltages. A 4064 t
cycle) delay after the oscillator becomes active allows the clock generator to stabilize. If RESET is at
logical 0 at the end of 4064 t
CYC
The POR circuit only initializes internal circuitry during cold starts. Refer to
Figure 1-7. External Reset
Circuit.
It is important to protect the MCU during power transitions. Most M68HC11
systems need an external circuit that holds the RESET pin low whenever
V
is below the minimum operating level. This external voltage level
DD
detector, or other external reset circuits, are the usual source of reset in a
system.
Freescale Semiconductor
, the CPU remains in the reset condition until RESET goes to logical 1.
NOTE
M68HC11E Family Data Sheet, Rev. 5.1
(internal clock
CYC
79