參數(shù)資料
型號: TMS320F28335_1
廠商: Texas Instruments, Inc.
英文描述: Variable Capacitance Diode for TV Tuner VHF Tuning; Ratings VR (V): 32; Characteristics n: 12.0 min; Characteristics rs (ohm) max: 0.85; Characteristics C (pF) max: C2 = 32.2 to 37.5 C25 = 2.57 to 3.0; Characteristics CVR/CVR: 2/25; Cl: 2.777; Package: UFP
中文描述: 數(shù)字信號控制器(DSC)
文件頁數(shù): 118/166頁
文件大?。?/td> 1889K
代理商: TMS320F28335_1
www.ti.com
A
t
w(RSL1)
t
h(boot-mode)(B)
V
DDIO
, V
DD3VFL
V
DDA2
, V
DDAIO
(3.3 V)
XCLKIN
X1/X2
XRS
Boot-Mode
Pins
V
DD
, V
DD1A18,
V
DD2A18
(1.9 V)
XCLKOUT
I/O Pins
(C)
User-Code Dependent
User-Code Dependent
Boot-ROM Execution Starts
Peripheral/GPIO Function
Based on Boot Code
GPIO Pins as Input
OSCCLK/16
(A)
GPIO Pins as Input (State Depends on Internal PU/PD)
t
OSCST
User-Code Dependent
Address/Data/
Control
(Internal)
Address/Data Valid. Internal Boot-ROM Code Execution Phase
User-Code Execution Phase
t
d(EX)
OSCCLK/8
TMS320F28335, TMS320F28334, TMS320F28332
Digital Signal Controllers (DSCs)
SPRS439B–JUNE 2007–REVISED OCTOBER 2007
A.
Upon power up, SYSCLKOUT is OSCCLK/4. Since both the XTIMCLK and CLKMODE bits in the XINTCNF2 register
come up with a reset state of 1, SYSCLKOUT is further divided by 4 before it appears at XCLKOUT. This explains
why XCLKOUT = OSCCLK/16 during this phase. Subsequently, boot ROM changes SYSCLKOUT to OSCCLK/2.
Because the XTIMCLK register is unchanged by the boot ROM, XCLKOUT is OSCCLK/8 during this phase.
After reset, the boot ROM code samples Boot Mode pins. Based on the status of the Boot Mode pin, the boot code
branches to destination memory or boot code function. If boot ROM code executes after power-on conditions (in
debugger environment), the boot code execution time is based on the current SYSCLKOUT speed. The SYSCLKOUT
will be based on user environment and could be with or without PLL enabled.
See
Section 6.8
for requirements to ensure a high-impedance state for GPIO pins during power-up.
B.
C.
Figure 6-6. Power-on Reset
118
Electrical Specifications
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