参数资料
型号: TMS470R1VF346BPZQ
厂商: TEXAS INSTRUMENTS INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 48 MHz, RISC MICROCONTROLLER, PQFP100
封装: PLASTIC, LQFP-100
文件页数: 21/56页
文件大小: 779K
代理商: TMS470R1VF346BPZQ
TMS470R1VF336A, TMS470R1VF346A
16/32-BIT RISC FLASH MICROCONTROLLERS
SPNS079I – OCTOBER 2002 – REVISED SEPTEMBER 2006
28
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251-1443
external reference resonator/crystal oscillator clock option
The oscillator is enabled by connecting the appropriate fundamental 4–20 MHz resonator/crystal and load
capacitors across the external OSCIN and OSCOUT pins as shown in Figure 4a. The oscillator is a single-
stage inverter held in bias by an integrated bias resistor. This resistor is disabled during leakage test measure-
ment and HALT mode. TI strongly encourages each customer to submit samples of the device to the
resonator/crystal vendors for validation. The vendors are equipped to determine what load capacitors will
best tune their resonator/crystal to the microcontroller device for optimum start-up and operation over temper-
ature/voltage extremes.
An external oscillator source can be used by connecting a 1.8 V clock signal to the OSCIN pin and leaving the
OSCOUT pin unconnected (open) as shown in Figure 4b.
NOTE A: The values of C1 and C2 should be provided by the resonator/crystal vendor.
Figure 4. Crystal/Clock Connection
External
Clock Signal
(toggling 0–1.8 V)
OSCOUT
OSCIN
C2
(see Note A)
C1
(see Note A)
Crystal
OSCOUT
OSCIN
(a)
(b)
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