64
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.
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
Figure 3.1 Reset Sequence