Renesas M3A-HS37 사용자 설명서

Functional Specifications 

2.9 Reset Module 

Rev.1.00 Oct 09, 2008 

2-13

REJ11J0021-0100 

 

 

 

2 

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. 

 

CPU-VCC

Delay capacity

Input

Output

Ra

M51957BP

SH7137

Rb

CPU-VCC

Cd

0.1  F

Reset 
switch
(SW2)

RES

RESET

Expansion connector

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

Open collector
output reset IC

H-UDI connector (14-pin)

RES

CPU-VCC

10 K

10 K

100 

4.7 K

CPU-VCC

 

Figure 2.9.1 Reset Module Block Diagram 

 

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. 

 

PB4/A18/IRQ2/POE4/TIC5US

NMI

SW

SH7137

CPU-VCC

SW

CPU-VCC

NMI switch

IRQ2 switch

Expansion 
connector

10 K

10 K

220 

220 

2.2  F

2.2  F

0 

0 

CPU-VCC

CPU-VCC

 

Figure 2.10.1 Interrupt Switch Block Diagram