Reset Control - Renesas RZ/A Series User Manual

RZ/A2M CPU Board RTK7921053C00000BE
2.8

Reset Control

The reset IC in RTK7921053C00000BE controls the reset signal connected to the RZ/A2M, memory devices, and
connectors.
There are two types of system reset: power-on reset and switch reset.
Figure 2.8.1 shows the reset control block diagram.
CoreSight 20 connector (CN5)
Reset switch (SW2)
3.3V
Reset IC (U15)
130kΩ
SENSE
1000pF
20kΩ
CT
4700pF
Reset IC output delay time
td=CT(nF)/175+0.5×10
reset IC output detection voltage
0.405×(Ra+Rb)/Rb=0.405×(130kΩ+20kΩ)/20kΩ=3.04V
Figure 2.8.1 Reset Control Block Diagram
R20UT4397EJ0100 Rev.1.00
2018.10.11
3.3V
3.3V
3.3V
TRST#
SRST #
3.3V
U14
+
3.3V
RESET #
-3
s=27.4ms
RZ/A2M (U1)
U12
RPC_RESET #
TRST#
RES#
U13
HM_RESET #/OM_RESET #
Note: Red characters
functions in use.
: Unmounted.
To SUB board
2. Function specifications
Serial flash memory (U2)
RESET #
HyperMCP (U3)
RESET #
indicate
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