MCR908JK3ECDWE Freescale Semiconductor, MCR908JK3ECDWE Datasheet - Page 113

• Manufacturer Part Number: MCR908JK3ECDWE
• Description: IC MCU 4K FLASH 8MHZ 20-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MCR908JK3ECDWE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 15
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 12x8b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SOIC (7.5mm Width)
• Processor Series: HC08JK
• Core: HC08
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 15
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: FSICEBASE, DEMO908JL16E, M68CBL05CE
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit, 12 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

Chapter 11
External Interrupt (IRQ)
11.1 Introduction
The IRQ (external interrupt) module provides a maskable interrupt input.
11.2 Features
Features of the IRQ module include the following:
11.3 Functional Description
A logic zero applied to the external interrupt pin can latch a CPU interrupt request.
structure of the IRQ module.
Interrupt signals on the IRQ pin are latched into the IRQ latch. An interrupt latch remains set until one of
the following actions occurs:
The external interrupt pin is falling-edge-triggered and is software-configurable to be either falling-edge
or falling-edge and low-level-triggered. The MODE bit in the INTSCR controls the triggering sensitivity of
the IRQ pin.
When the interrupt pin is edge-triggered only, the CPU interrupt request remains set until a vector fetch,
software clear, or reset occurs.
When the interrupt pin is both falling-edge and low-level-triggered, the CPU interrupt request remains set
until both of the following occur:
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A dedicated external interrupt pin, IRQ
IRQ interrupt control bits
Hysteresis buffer
Programmable edge-only or edge and level interrupt sensitivity
Automatic interrupt acknowledge
Selectable internal pullup resistor
Vector fetch — A vector fetch automatically generates an interrupt acknowledge signal that clears
the IRQ latch.
Software clear — Software can clear the interrupt latch by writing to the acknowledge bit in the
interrupt status and control register (INTSCR). Writing a one to the ACK bit clears the IRQ latch.
Reset — A reset automatically clears the interrupt latch.
Vector fetch or software clear
Return of the interrupt pin to logic one
MC68HC908JL3E Family Data Sheet, Rev. 4
Figure 11-1
shows the
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