When system power is turned on or off, the
RES
pin should be held low.
Figure 3-1 shows the reset sequence starting from
RES
input.
Figure 3-1 Reset Sequence
Vector fetch
ø
Internal
address bus
Internal read
signal
Internal write
signal
Internal data
bus (16-bit)
RES
Internal
processing
Program initial
instruction prefetch
(1) Reset exception handling vector address (H'0000)
(2) Program start address
(3) First instruction of program
(2)
(3)
(2)
(1)
Reset cleared
64