MC68HC908JL8CP Freescale Semiconductor, MC68HC908JL8CP Datasheet - Page 164

• Manufacturer Part Number: MC68HC908JL8CP
• Description: IC MCU 8K FLASH 8MHZ 28-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908JL8CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LED, LVD, POR, PWM
• Number Of I /o: 23
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 13x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

External Interrupt (IRQ)
The vector fetch or software clear may occur before or after the interrupt pin returns to logic one. As long
as the pin is low, the interrupt request remains pending. A reset will clear the latch and the MODE control
bit, thereby clearing the interrupt even if the pin stays low.
When set, the IMASK bit in the INTSCR mask all external interrupt requests. A latched interrupt request
is not presented to the interrupt priority logic unless the IMASK bit is clear.
12.3.1 IRQ Pin
A logic zero on the IRQ pin can latch an interrupt request into the IRQ latch. A vector fetch, software clear,
or reset clears the IRQ latch.
If the MODE bit is set, the IRQ pin is both falling-edge-sensitive and low-level-sensitive. With MODE set,
both of the following actions must occur to clear IRQ:
164
Addr.
$001D
IRQPUD
IRQ
IRQ Status and Control
Register Name
The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests. (See
Control.)
DECODER
VECTOR
FETCH
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
RESET
ACK
V
DD
INTERNAL
PULLUP
DEVICE
(INTSCR)
Register
Reset:
Read:
Write:
Figure 12-1. IRQ Module Block Diagram
Figure 12-2. IRQ I/O Register Summary
V
MODE
DD
Bit 7
D
0
0
CK
CLR
Q
= Unimplemented
6
0
0
NOTE
5
0
0
IMASK
SYNCHRONIZER
4
0
0
VOLTAGE
DETECT
HIGH
IRQF
3
0
5.5 Exception
ACK
2
0
0
IRQF
Freescale Semiconductor
IMASK
1
0
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQ
INTERRUPT
REQUEST
TO MODE
SELECT
LOGIC
MODE
Bit 0
0