MC68HC705C8ACFN Freescale Semiconductor, MC68HC705C8ACFN Datasheet - Page 57

• Manufacturer Part Number: MC68HC705C8ACFN
• Description: IC MCU 4MHZ 8K OTP 44-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC05r

Specifications of MC68HC705C8ACFN

• Core Processor: HC05
• Core Size: 8-Bit
• Speed: 2.1MHz
• Connectivity: SCI, SPI
• Peripherals: POR, WDT
• Number Of I /o: 24
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 304 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

4.4 Interrupt Processing
MC68HC705C8A — Rev. 3
MOTOROLA
The CPU takes these actions to begin servicing an interrupt:
The return-from-interrupt (RTI) instruction causes the CPU to recover
the CPU registers from the stack as shown in
Function
interrupts
interrupts
interrupts
Software
interrupt
External
interrupt
1. Stores the CPU registers on the stack in the order shown in
2. Sets the I bit in the CCR to prevent further interrupts
3. Loads the program counter with the contents of the appropriate
Freescale Semiconductor, Inc.
Reset
(SWI)
Timer
SCI
SPI
For More Information On This Product,
Figure 4-4
interrupt vector locations as shown in
RESET pin
Port B pins
Table 4-1. Reset/Interrupt Vector Addresses
User code
Go to: www.freescale.com
Power-on
MODF bit
RDRF bit
TDRE bit
IDLE bit
SPIF bit
Source
IRQ pin
OCF bit
TOF bit
ICF bit
OR bit
TC bit
logic
Interrupts
OCIE bit
TOIE bit
TCIE bit
ICIE bit
ILIE bit
RIE bit
Local
Mask
None
None
None
SPIE
Global
Mask
None
None
I bit
I bit
I bit
I bit
(1 = Highest)
Same priority
instruction
Table
Priority
as any
Figure
1
2
3
4
5
4-1.
4-4.
Interrupt Processing
Vector Address
$1FFC–$1FFD
$1FFE–$1FFF
$1FFA–$1FFB
$1FF8–$1FF9
$1FF6–$1FF7
$1FF4–$1FF5
Technical Data
Interrupts
57