NEC PD78052 User Manual page 476

[Example]
Occurrence of INTSER
7 clocks of CPU clock (MIN.)
(time from interrupt request to servicing)
476
CHAPTER 19 SERIAL INTERFACE CHANNEL 2
Main processing
EI
UART reception error interrupt
(INTSER) servicing
Instructions
equivalent to
2205 CPU
clocks (MIN.)
are necessary.
MOV A, RXB
RETI