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)： 119/166頁
文件大?。?/td> 1889K
代理商： TMS320F28335_1
www.ti.com
A
t
h(boot-mode)(A)
t
w(RSL2)
XCLKIN
X1/X2
XRS
Boot-Mode
Pins
XCLKOUT
I/O Pins
Address/Data/
Control
(Internal)
Boot-ROM Execution Starts
User-Code Execution Starts
User-Code Dependent
User-Code Execution Phase
(Don’t Care)
User-Code Dependent
User-Code Execution
Peripheral/GPIO Function
User-Code Dependent
GPIO Pins as Input (State Depends on Internal PU/PD)
GPIO Pins as Input
Peripheral/GPIO Function
t
d(EX)
OSCCLK * 5
OSCCLK/8
TMS320F28335, TMS320F28334, TMS320F28332
Digital Signal Controllers (DSCs)
SPRS439B–JUNE 2007–REVISED OCTOBER 2007
Table 6-12. Reset (XRS) Timing Requirements
MIN
NOM
MAX
UNIT
cycles
cycles
t
w(RSL1)
t
w(RSL2)
(1)
Pulse duration, stable XCLKIN to XRS high
Pulse duration, XRS low
Pulse duration, reset pulse generated by
watchdog
Delay time, address/data valid after XRS high
Oscillator start-up time
Hold time for boot-mode pins
8t
c(OSCCLK)
8t
c(OSCCLK)
Warm reset
t
w(WDRS)
512t
c(OSCCLK)
cycles
t
d(EX)
t
OSCST(2)
t
h(boot-mode)
32t
c(OSCCLK)
cycles
ms
cycles
1
10
200t
c(OSCCLK)
(1)
(2)
In addition to the t
requirement, XRS has to be low at least for 1 ms after V
DD
reaches 1.5 V.
Dependent on crystal/resonator and board design.
A.
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.
Figure 6-7. Warm Reset
Figure 6-8
shows an example for the effect of writing into PLLCR register. In the first phase, PLLCR =
0x0004 and SYSCLKOUT = OSCCLK x 2. The PLLCR is then written with 0x0008. Right after the PLLCR
register is written, the PLL lock-up phase begins. During this phase, SYSCLKOUT = OSCCLK/2. After the
PLL lock-up is complete (which takes 131072 OSCCLK cycles), SYSCLKOUT reflects the new operating
frequency, OSCCLK x 4.
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Electrical Specifications
119
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