参数资料
型号: RM48L950PGET
厂商: TEXAS INSTRUMENTS INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 200 MHz, RISC MICROCONTROLLER, PQFP144
封装: GREEN, PLASTIC, LQFP-144
文件页数: 106/154页
文件大小: 2807K
代理商: RM48L950PGET
PRODUCTPREVIEW
SPNS174
– SEPTEMBER 2011
4.4
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.
This terminal has a glitch filter. It also has an internal pullup
4.4.1
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
4.4.2
nRST Timing Requirements
Table 4-6. nRST Timing Requirements(1)
PARAMETER
MIN
MAX
UNIT
tv(RST)
Valid time, nRST active after
1180 tc(OSC) + 1048tc(OSC)
ns
nPORRST inactive
Valid time, nRST active (all other
8tc(VCLK)
System reset conditions)
tf(nRST)
500
2000
ns
Filter time nRST pin;
pulses less than MIN will be
filtered out, pulses greater than
MAX will generate a reset
(1)
Specified values do NOT include rise/fall times. For rise and fall timings, see the switching characteristics for output timings versus load
capacitance table.
Copyright
2011, Texas Instruments Incorporated
System Information and Electrical Specifications
55
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