TC1796
System Units (Vol. 1 of 2)
Reset and Boot Operation
User’s Manual 4-5 V2.0, 2007-07
Reset, V2.0
4.1.1.2 Reset Request Register
The reset request register RST_REQ is used to generate a software reset. Unlike the
other reset causes, the software reset can exclude functions (System Timer reset and
hardware reset (HDRST) generation) from the reset. Additionally, the boot configuration
information can be set by software.
RST_REQ is Endinit-protected, meaning that bit WDT_CON0.ENDINIT must be set to 0
first through the password-protected access scheme provided for the watchdog timer
register WDT_CON0. Once access is gained through the Endinit-protection scheme,
RST_REQ can be written, causing the requested software reset.
RST_REQ
Reset Request Register (F0000010
H
) Reset Value: 0000 0000
H
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0
SW
BO
OT
0
SW
BRK
IN
0SWCFG
rrwrrwrrw
1514131211109876543210
0
RR
EXT
0
RR
STM
rrwrrw
Field Bits Type Description
RRSTM 0rwReset Request for the System Timer
0
B
Do not reset the System Timer
1
B
Reset the System Timer
RREXT 2rwReset Request for External Devices
0
B
Do not activate hardware reset output HDRST
1
B
Activate hardware reset output HDRST
SWCFG [19:16] rw Software Boot Configuration
A software boot configuration different from the
external applied hardware configuration can be
specified with these bits. The encoding of this bit field
is equal to the RST_SR.HWCFG line encoding.
SWBRKIN 21 rw Software Break Signal Boot Value
This bit determines the desired value for the BRKIN
input signal to be used for software boot.
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