Texas Instruments Hercules TMS570LS04x/03x LaunchPad Evaluation Kit LAUNCHXL-TMS57004 LAUNCHXL-TMS57004 Data Sheet
Product codes
LAUNCHXL-TMS57004
SPNS186A – OCTOBER 2012 – REVISED SEPTEMBER 2013
4.3
Warm Reset (nRST)
This is a bidirectional reset signal. The internal circuitry drives the signal low on detecting any device reset
condition. An external circuit can assert a device reset by forcing the signal low. On this terminal, the
output buffer is implemented as an open drain (drives low only). To ensure an external reset is not
arbitrarily generated, TI recommends that an external pullup resistor is connected to this terminal.
condition. An external circuit can assert a device reset by forcing the signal low. On this terminal, the
output buffer is implemented as an open drain (drives low only). To ensure an external reset is not
arbitrarily generated, TI recommends that an external pullup resistor is connected to this terminal.
This terminal has a glitch filter. It also has an internal pullup
4.3.1
Causes of Warm Reset
Table 4-5. Causes of Warm Reset
DEVICE EVENT
SYSTEM STATUS FLAG
Power-Up Reset
Exception Status Register, bit 15
Oscillator fail
Global Status Register, bit 0
PLL slip
Global Status Register, bits 8 and 9
Watchdog exception / Debugger reset
Exception Status Register, bit 13
CPU Reset (driven by the CPU STC)
Exception Status Register, bit 5
Software Reset
Exception Status Register, bit 4
External Reset
Exception Status Register, bit 3
4.3.2
nRST Timing Requirements
Table 4-6. nRST Timing Requirements
PARAMETER
MIN
MAX
UNIT
t
v(RST)
Valid time, nRST active after
2256t
c(OSC)
(1)
ns
nPORRST inactive
Valid time, nRST active (all other
32t
c(VCLK)
System reset conditions)
t
f(nRST)
Filter time nRST pin;
475
2000
ns
Pulses less than MIN will be
filtered out, pulses greater than
MAX will generate a reset
filtered out, pulses greater than
MAX will generate a reset
(1)
Assumes the oscillator has started up and stabilized before nPORRST is released .
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System Information and Electrical Specifications
27
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