MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 163
MC68HC908LB8CPE
Manufacturer Part Number
MC68HC908LB8CPE
Description
IC MCU 8K FLASH 8MHZ 20DIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC68HC908LB8CDWE.pdf
(234 pages)
Specifications of MC68HC908LB8CPE
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVR, POR, PWM
Number Of I /o
18
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 7x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Connectivity
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68HC908LB8CPE
Manufacturer:
IR
Quantity:
10
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Chapter 16
Resets and Interrupts
16.1 Introduction
Resets and interrupts are responses to exceptional events during program execution. A reset re-initializes
the microcontroller (MCU) to its startup condition. An interrupt vectors the program counter to a service
routine.
16.2 Resets
A reset immediately returns the MCU to a known startup condition and begins program execution from a
user-defined memory location.
16.2.1 Effects
A reset:
16.2.2 External Reset
A logic 0 applied to RST for a time, t
configured as a reset pin. An external reset sets the PIN bit in the system integration module (SIM) reset
status register.
16.2.3 Internal Reset
Sources:
16.2.3.1 Power-On Reset (POR)
A power-on reset (POR) is an internal reset caused by a positive transition on the V
POR must go below POR rearm voltage (V
a POR. The POR is not a brown-out detector, low-voltage detector, or glitch detector.
A power-on reset:
Freescale Semiconductor
•
•
•
•
•
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Immediately stops the operation of the instruction being executed
Initializes certain control and status bits
Loads the program counter with a user-defined reset vector address from locations $FFFE and
$FFFF
Power-on reset (POR)
Computer operating properly (COP)
Low-power reset circuits
Illegal opcode
Illegal address
Drives the RST pin low during the oscillator stabilization delay
IRL
MC68HC908LB8 Data Sheet, Rev. 1
, generates an external reset when pin PTA5/RST/KB5 is
POR
) to reset the MCU. This distinguishes between a reset and
DD
pin. V
DD
at the
163
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