參數(shù)資料
型號: 9202
廠商: 意法半導(dǎo)體
英文描述: Flash Programmable System Devices with 8032 Microcontroller Core
中文描述: 閃存可編程系統(tǒng)設(shè)備與8032微控制器內(nèi)核
文件頁數(shù): 50/175頁
文件大?。?/td> 1731K
代理商: 9202
UPSD3254A, UPSD3254BV, UPSD3253B, UPSD3253BV
50/175
OSCILLATOR
The oscillator circuit of the uPSD325X devices is a
single stage inverting amplifier in a Pierce oscilla-
tor configuration. The circuitry between XTAL1
and XTAL2 is basically an inverter biased to the
transfer point. Either a crystal or ceramic resonator
can be used as the feedback element to complete
the oscillator circuit. Both are operated in parallel
resonance.
XTAL1 is the high gain amplifier input, and XTAL2
is the output. To drive the uPSD325X devices ex-
ternally, XTAL1 is driven from an external source
and XTAL2 left open-circuit.
Figure 19. Oscillator
SUPERVISORY
There are four ways to invoke a reset and initialize
the uPSD325X devices.
I
Via the external RESET pin
I
Via the internal LVR Block.
I
Via USB bus reset signaling.
I
Via Watch Dog timer
The RESET mechanism is illustrated in Figure 20.
Figure 20. RESET Configuration
AI06620
XTAL1
XTAL2
8 to 40 MHz
XTAL1
XTAL2
External Clock
AI06621
Reset
CPU
&
PERI.
Noise
Cancel
LVR
S
Q
R
CPU
Clock
Sync
10ms
Timer
USB Reset
RSTE
WDT
PSD_RST
Active Low
10ms at 40Mhz
50ms at 8Mhz
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