System Hardware Reset Timing; Power-On Reset Output; Figure 6.3 System Hardware Reset Related Pins; Figure 6.4 Power-On Reset Diagram, Tporst=10Ms - Hitachi HD64465 User Manual

6.4

System Hardware Reset Timing

HD64465 provides the system hardware reset function to control SH-4/SH-3 CPU power-on reset
or manual reset. In Figure 6-3, it shows that two input signals on HD64465, RESETMI# and
RESETPI#, which control the manual reset and power-on reset respectively. The other signals,
RESETPO# and RESETMO#, are the output signals connected to SH-4/SH-3 CPU for power-on
reset and manual reset. AFECK must be input to enable this function.
6.4.1

Power-On Reset Output

When RESETPI# is asserted, it means the power-on reset has occurred. The power-on reset signal
output from HD64465, RESETPO#, is connected to CPU power-on reset input. The related timing
is illustrated in Fig 6-4.
RESETPI#
RESETPO#
RESETMO#
RESETMI#
RESETPI#

Figure 6.3 System Hardware Reset Related Pins

Figure 6.4 Power-On Reset Diagram, tPORST=10ms

RESETMO#
HD64465
RESETPO#
tPORST
Rev. 3.0, 03/01, page 65 of 390