MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 141

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

10.2
The MCU can be interrupted by five different sources: three maskable hardware interrupts, one
non maskable software interrupt and one maskable MCAN interrupt:
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Interrupts cause the processor to save the register contents on the stack and to set the interrupt
mask (I-bit) to prevent additional interrupts. The RTI instruction (return from interrupt) causes the
register contents to be recovered from the stack and normal processing to resume. While
executing the RTI instruction, the value of the I-bit is replaced by the corresponding I-bit stored on
the stack.
Unlike reset, hardware interrupts do not cause the current instruction execution to be halted, but
are considered pending until the current instruction is complete. The current instruction is the one
already fetched and being operated on. When the current instruction is complete, the processor
checks all pending hardware interrupts. If interrupts are not masked (I-bit clear) and the
corresponding interrupt enable bit is set, the processor proceeds with interrupt processing;
otherwise, the next instruction is fetched and executed.
Note:
MC68HC05X16
External signal on the IRQ pin, WOI on port B pins or NWOI pin
Serial communications interface (SCI)
Programmable timer
Software interrupt instruction (SWI)
MCAN interrupt (CIRQ)
Power-on and external reset clear all interrupt enable bits to prevent interrupts during
the reset sequence, but set the INTE bit (see
Interrupts
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RESETS AND INTERRUPTS
Section
3.8).
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