參數(shù)資料
型號(hào)： NS32FX16-15
廠商： National Semiconductor Corporation
英文描述： FILM/M CAPACITANCE=0.001 VOLT=630
中文描述： 影像/信號(hào)處理器
文件頁(yè)數(shù)： 41/88頁(yè)
文件大小： 902K
代理商： NS32FX16-15
3.0 Functional Description
(Continued)
TL/EE/10818–25
FIGURE 3-17. Recommended Reset Connections
TABLE 3-5. External Oscillator
Specifications Crystal Characteristics
Type
AT-Cut
Tolerance
0.005% at
a
25
§
C
0.01% from 0
§
C to
a
70
§
C
Stability
Resonance
30 MHz:
40 MHz or 50 MHz:
Fundamental (Parallel)
Third Overtone (Parallel)
Maximum Series Resistance
50
X
7 pF
Maximum Shunt Capacitance
R, C and L Values
Frequency
(MHz)
R1
(k
X
)
R2
(
X
)
C1
(pF)
C2
(pF)
C3
(pF)
L
(
m
H)
30
30
40
50
180
180
150
150
51
51
51
51
20
20
20
20
20
20
20
20
800–1300
800–1300
800–1300
3.3
1.8
1.1
3.5.3 Power Save Mode
The NS32FX16 provides a power save feature that can be
used to significantly reduce the power consumption at times
when the computational demand decreases. The device
uses the clock signal at the OSCIN pin to derive the internal
clock as well as the external signals CTTL and FCLK. The
frequency of these clock signals is affected by the clock
scaling factor. Scaling factors of 1, 2, 4, or 8 can be select-
ed by properly setting the C- and M-bits in the CFG register.
The power save mode should not be used to reduce the
clock frequency below the minimum frequency required by
the CPU.
Upon reset, both C and M are set to zero, thus maximum
clock rate is selected.
Due to the fact that the C- and M-bits are programmed by
the SETCFG instruction, the power save feature can only be
controlled by programs running in supervisor mode.
The following table shows the C- and M-bit settings for the
various scaling factors, and the resulting supply current for a
crystal frequency of 50 MHz.
Clock Scaling Factor vs Supply Current
C
M
Scaling
Factor
CPU Clock
Frequency
Typical I
CC
at
a
5V
0
0
1
1
0
1
0
1
1
2
4
8
25 MHz
12.5 MHz
6.25 MHz
3.13 MHz
170 mA
100 mA
65 mA
45 mA
3.5.4 Resetting
The RSTI input pin is used to reset the NS32FX16. The CPU
samples RSTI on the falling edge of CTTL.
Whenever a low level is detected, the CPU responds imme-
diately. Any instruction being executed is terminated; any
results that have not yet been written to memory are dis-
carded; and any pending interrupts and traps are eliminated.
The internal latch for the edge-sensitive NMI signal is
cleared. The DSP module ST register is set to 0.
On application of power, RSTI must be held low for at least
50
m
s after V
CC
is stable. This is to ensure that all on-chip
voltages are completely stable before operation. Whenever
a Reset is applied, it must also remain active for not less
than 64 CTTL cycles. See Figures 3-18 and 3-19.
TL/EE/10818–26
FIGURE 3-18. Power-On Reset Requirements
TL/EE/10818–27
FIGURE 3-19. General Reset Timing
While in the Reset state, the CPU drives the signals ADS,
IAS, RD, WR, DBE, TSO, BPU, and DDIN inactive. AD0–
AD15, A16–A23 and SPC are floated, ALE is HIGH and the
state of all other output signals is undefined.
The internal CPU clock and CTTL run at half the frequency
of the signal on the OSCIN pin.
The HOLD signal must be kept inactive. After the RSTI sig-
nal is driven high, the CPU will stay in the reset condition for
approximately 8 clock cycles and then it will begin execution
at address 0.
The PSR is reset to 0. The CFG C- and M-bits are reset to 0.
FCLK runs at the same frequency as OSCIN. NMI is en-
abled to allow Non-Maskable Interrupts. The following con-
ditions are present after reset due to the PSR being reset to
0:
41
相關(guān)PDF資料
PDF描述
NS32FX16-20 Imaging/Signal Processor
NS32FX16-25 Imaging/Signal Processor
NS32FX164-20 Advanced Imaging/Communication Signal Processors(高級(jí)圖象/通訊信號(hào)處理器)
NS32FV16-25 Advanced Imaging/Communication Signal Processors
NS32FX164-25 Advanced Imaging/Communication Signal Processors(高級(jí)圖象/通訊信號(hào)處理器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NS32FX16-20 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Imaging/Signal Processor
NS32FX16-25 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Imaging/Signal Processor
NS32FX164 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
NS32FX164-20 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Imaging/Communication Signal Processors
NS32FX164-25 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Imaging/Communication Signal Processors
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