MC68HC908GR8CD Freescale Semiconductor, MC68HC908GR8CD Datasheet - Page 120
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MC68HC908GR8CD
Manufacturer Part Number
MC68HC908GR8CD
Description
8-bit Microcontrollers - MCU 8 Bit 8MHz
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68HC908GR8CD.pdf
(286 pages)
Specifications of MC68HC908GR8CD
Product Category
8-bit Microcontrollers - MCU
Rohs
yes
Core
HC08
Data Bus Width
8 bit
Maximum Clock Frequency
8 MHz
Program Memory Size
64 KB
Data Ram Size
384 B
Operating Supply Voltage
3 V to 5 V
Package / Case
SOIC-28
Mounting Style
SMD/SMT
Data Rom Size
64 KB
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
21
Program Memory Type
Flash
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External Interrupt (IRQ)
12.6 IRQ Status and Control Register
The IRQ status and control register (INTSCR) controls and monitors operation of the IRQ module. The
INTSCR:
IRQF — IRQ Flag Bit
ACK — IRQ Interrupt Request Acknowledge Bit
IMASK — IRQ Interrupt Mask Bit
MODE — IRQ Edge/Level Select Bit
120
•
•
•
•
This read-only status bit is high when the IRQ interrupt is pending.
Writing a 1 to this write-only bit clears the IRQ latch. ACK always reads as logic 0. Reset clears ACK.
Writing a 1 to this read/write bit disables IRQ interrupt requests. Reset clears IMASK.
This read/write bit controls the triggering sensitivity of the IRQ pin. Reset clears MODE.
1 = IRQ interrupt pending
0 = IRQ interrupt not pending
1 = IRQ interrupt requests disabled
0 = IRQ interrupt requests enabled
1 = IRQ interrupt requests on falling edges and low levels
0 = IRQ interrupt requests on falling edges only
Shows the state of the IRQ flag
Clears the IRQ latch
Masks IRQ interrupt request
Controls triggering sensitivity of the IRQ interrupt pin
Address:
Reset:
Read:
Write:
Figure 12-3. IRQ Status and Control Register (INTSCR)
$001D
Bit 7
0
0
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
= Unimplemented
6
0
0
5
0
0
4
0
0
IRQF
3
0
ACK
2
0
0
IMASK
1
0
Freescale Semiconductor
MODE
Bit 0
0
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