參數(shù)資料
型號(hào): TMS320C240PQQ
英文描述: 16-Bit Microcontroller
中文描述: 16位微控制器
文件頁(yè)數(shù): 77/105頁(yè)
文件大小: 1481K
代理商: TMS320C240PQQ
TMS320C240, TMS320F240
DSP CONTROLLERS
SPRS042D – OCTOBER 1996 – REVISED NOVEMBER 1998
77
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
RS and PORESET timings
switching characteristics over recommended operating conditions for a reset [H = 0.5t
c(CO)
]
(see Figure 31 and Figure 32)
PARAMETER
MIN
MAX
UNIT
tw(RSL1)
td(RS)
td(EX)
The parameter tw(RSL1) refers to the time RS is an output.
Pulse duration, RS low
8tc(SYS)
4H
ns
Delay time, RS low to program address at reset vector
ns
Delay time, RS high to reset vector executed
32H
ns
timing requirements over recommended operating conditions for a reset [H = 0.5t
c(CO)
]
(see Figure 31 and Figure 32)
MIN
MAX
UNIT
tw(RSL)
The parameter tw(RSL) refers to the time RS is an input.
Pulse duration, RS or PORESET low
5
ns
XTAL1/CLKIN
VCC
RS
PORESET
PORESET is required to be driven low during power up to ensure all clock/PLL registers are reset to a known state.
RS is a bidirectional (open-drain output) pin and can be optionally pulled low through an open-drain or open-collector drive circuit, or through
a 2.7-k
resistor in series with a totem pole drive circuit. If RS is left undriven, then a 20-k
pullup resistor should be used.
Figure 31. Reset Timings
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