upd17240 Renesas Electronics Corporation., upd17240 Datasheet - Page 67

• Manufacturer Part Number: upd17240
• Description: 4-bit Single-chip Microcontrollers For Small General-purpose Infrared Remote Control Transmitters
• Manufacturer: Renesas Electronics Corporation.

8.3.2
immediately before the RETI instruction.
has been executed. Therefore, the interrupt is not acknowledged between the EI and RETI instructions.
To return from an interrupt processing routine, use the RETI instruction.
The following processing is then executed within an instruction cycle.
To enable an interrupt after the processing of an interrupt has finished, the EI instruction must be executed
Interrupt acknowledgement is enabled by the EI instruction after the instruction next to the EI instruction
Returning from interrupt processing routine
µ PD17240, 17241, 17242, 17243, 17244, 17245, 17246
Increments value of stack pointer by 1
Loads contents of stack addressed by
stack pointer to program counter
Data Sheet U15002EJ1V1DS
Loads contents of interrupt
stack register to PSWORD
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