UPD784035YGC NEC, UPD784035YGC Datasheet - Page 46

• Manufacturer Part Number: UPD784035YGC
• Description: 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: NEC

8.
8.1 Interrupt Sources
execution of the BRK instruction or BRKCS instruction, or an operand error.
and that which of the two or more interrupts that simultaneously occur should be serviced first. When the macro service
function is used, however, nesting always proceeds.
the same request, simultaneously generate (refer to Table 8-2).
46
Vectored interrupt
Context switching
Macro service
As the servicing in response to an interrupt request, the three types shown in Table 8-1 can be selected by program.
Table 8-2 shows the interrupt sources available. As shown, interrupts are generated by 24 types of sources,
The priority of interrupt servicing can be set to four levels, so that nesting can be controlled during interrupt servicing
The default priority is the priority (fixed) of the service that is performed if two or more interrupt requests, having
Servicing Mode
INTERRUPT FUNCTION
Software
Firmware
Entity of Servicing
Table 8-1. Servicing of Interrupt Request
Branches and executes servicing routine
(servicing is arbitrary).
Automatically switches register bank,
branches and executes servicing routine
(servicing is arbitrary).
Executes data transfer between memory
and I/O (servicing is fixed)
PD784035Y, 784036Y, 784037Y, 784038Y
Servicing
Saves to and restores
from stack.
Saves to or restores from
fixed area in register bank
Retained
Contents of PC and PSW