MC908MR8MPE Freescale Semiconductor, MC908MR8MPE Datasheet - Page 298

• Manufacturer Part Number: MC908MR8MPE
• Description: IC MCU 8BIT 8K FLASH 28-PDIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908MR8MPE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 12
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

External Interrupt (IRQ)
$003F
16.4 Functional Description
Technical Data
298
Addr.
IRQ
IRQ Status/Control Register
Register Name
See page 303.
V
MODE1
DD
A logic 0 applied to any of the external interrupt pins can latch a CPU
interrupt request.
Interrupt signals on the IRQ pin are latched into the IRQ latch. An
interrupt latch remains set until one of the following actions occurs:
(ISCR)
Figure 16-2. IRQ I/O Register Summary
Figure 16-1. IRQ Module Block Diagram
•
•
•
D
CK
LATCH
ACK1
CLR
IRQ
Vector fetch — A vector fetch automatically generates an interrupt
acknowledge signal that clears the latch that caused the vector
fetch.
Software clear — Software can clear an interrupt latch by writing
to the appropriate acknowledge bit in the interrupt status and
control register (ISCR). Writing a logic 1 to the ACK1 bit clears the
IRQ latch.
Reset — A reset automatically clears both interrupt latches.
Q
Reset:
Read:
Write:
External Interrupt (IRQ)
Bit 7
R
R
0
0
Figure 16-1
IMASK1
= Reserved
R
6
0
0
SYNCHRO-
VOLTAGE
DETECT
NIZER
HIGH-
shows the structure of the IRQ module.
R
5
0
0
R
4
0
0
IRQF
3
0
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
ACK1
2
0
0
IMASK
IRQ
INTERRUPT
REQUEST
TO MODE
SELECT
LOGIC
1
1
0
MODE
Bit 0
1
0