MC68HC908QT2CPE Freescale, MC68HC908QT2CPE Datasheet - Page 77

MC68HC908QT2CPE

Manufacturer Part Number
MC68HC908QT2CPE
Description
Manufacturer
Freescale
Datasheet

Specifications of MC68HC908QT2CPE

Cpu Family
HC08
Device Core Size
8b
Frequency (max)
8MHz
Total Internal Ram Size
128Byte
# I/os (max)
6
Number Of Timers - General Purpose
2
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
4-chx8-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Through Hole
Pin Count
8
Package Type
PDIP
Program Memory Type
Flash
Program Memory Size
1.5KB
Lead Free Status / RoHS Status
Compliant
8.7.1 IRQ Input Pins (IRQ)
The IRQ pin provides a maskable external interrupt source. The IRQ pin contains an internal pullup
device.
8.8 Registers
The IRQ status and control register (INTSCR) controls and monitors operation of the IRQ module. See
Chapter 5 Configuration Register
The INTSCR has the following functions:
IRQF — IRQ Flag
ACK — IRQ Interrupt Request Acknowledge Bit
IMASK — IRQ Interrupt Mask Bit
MODE — IRQ Edge/Level Select Bit
Freescale Semiconductor
This read-only status bit is set when the IRQ interrupt is pending.
Writing a 1 to this write-only bit clears the IRQ latch. ACK always reads as 0.
Writing a 1 to this read/write bit disables the IRQ interrupt request.
This read/write bit controls the triggering sensitivity of the IRQ pin.
1 = IRQ interrupt pending
0 = IRQ interrupt not pending
1 = IRQ interrupt request disabled
0 = IRQ interrupt request enabled
1 = IRQ interrupt request on falling edges and low levels
0 = IRQ interrupt request on falling edges only
Shows the state of the IRQ flag
Clears the IRQ latch
Masks the IRQ interrupt request
Controls triggering sensitivity of the IRQ interrupt pin
Address: $001D
Reset:
Read:
Write:
Figure 8-3. IRQ Status and Control Register (INTSCR)
Bit 7
0
0
= Unimplemented
MC68HC908QY/QT Family Data Sheet, Rev. 6
(CONFIG).
6
0
0
5
0
0
4
0
0
IRQF
3
0
ACK
2
0
0
IMASK
1
0
MODE
Bit 0
0
Registers
77

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