Reset Module; Interrupt Switches - Renesas M3A-HS37 User Manual

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2.9 Reset Module

The reset circuit controls the SH7137 reset signals on the M3A-HS37.
Figure 2.9.1 shows the M3A-HS37 reset module block diagram.
Reset IC output delay time: td = 0.34 x Cd (pF) = 34 ms
Reset IC output detection voltage: Ra = 10 K , Rb = 10 K
Vs = 1.25 x (Ra+Rb)/Rb = 2.5 V
CPU-VCC
Ra
10 K
Rb
10 K

2.10 Interrupt Switches

The M3A-HS37 is provided with two push-button switches (NMI switch and IRQ2 switch) for the NMI pin and IRQ2 pin of the
SH7137.Figure 2.10.1 shows the interrupt switch block diagram.
SW
NMI switch
SW
IRQ2 switch
Rev.1.00 Oct 09, 2008
REJ11J0021-0100
CPU-VCC CPU-VCC
Open collector
4.7 K
output reset IC
M51957BP
Input
Output
Delay capacity
Cd
0.1 F
Figure 2.9.1 Reset Module Block Diagram
CPU-VCC CPU-VCC
10 K
220
2.2 F
CPU-VCC CPU-VCC
10 K
220
2.2 F
Expansion
connector
Figure 2.10.1 Interrupt Switch Block Diagram
Expansion connector
RESET
CPU-VCC
SH7137
RES
100
Reset
switch H-UDI connector (14-pin)
(SW2)
RES
0
NMI
0
PB4/A18/IRQ2/POE4/TIC5US
Functional Specifications
2.9 Reset Module
SH7137
2-13