Reset Module - Renesas Renasas Single-Chip Microcomputer SH7086 User Manual

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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.
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
Vcc
Reset IC
M51957BP
Ra
Open-collector output
Input
Rb
Delay capacitance
Rev.1.0 Feb 06. 2007
REJ10J0916-0100
Vcc
Output
Reset Switch
Cd 0.1uF
SW2
Figure2.8.1 Block Diagram of Reset Module
H-UDI Connector(J1,J2)
RESET
Extension
Connector(J14)
Functional Overview
2.8 Reset Module
Flash Memory
RP
（not mounted）
Extension Connector(J10)
RESET
SH7086
RES
2-15