Renesas SuperH M3A-HS86 - Manual (Page 33)

Functional Overview
2.8 Reset Module
Rev.1.0 Feb 06. 2007 2-15
REJ10J0916-0100
2
2.8 Reset Module
Reset module controls the reset signal connected to the SH7086, which mounted on the M3A-HS86. Moreover,
when the flash memory is mounted, it is used as a reset signal of the flash memory.
Figure2.8.1 shows the block diagram of reset module in the M3A-HS86.
Vcc
Delay capacitance
Input Output
Ra
Reset IC
M51957BP
Open-collector output
SH7086
Rb
Vcc
Cd 0.1uF Reset Switch
SW2
RES
RESET
RP
Extension
Connector(J14)
Flash Memory
（not mounted）
Reset IC output delay time ,td = 0.34 × Cd(pF)usec = 34ms
Reset IC output detection voltage, Vs
・M3A-HS86(3.3V Version)
Ra=10KΩ、Rb=10KΩ
Vs = 1.25 × (Ra+Rb)/Rb = 2.50V
・M3A-HS60(5V Version)
Ra=20KΩ、Rb=10KΩ
Vs = 1.25 × (Ra+Rb)/Rb = 3.75V
H-UDI Connector(J1,J2)
RESET
Extension Connector(J10)
Figure2.8.1 Block Diagram of Reset Module