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UPSD323X bảng dữ liệu(PDF) 49 Page - STMicroelectronics

tên linh kiện UPSD323X
Giải thích chi tiết về linh kiện  Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
PDF  176 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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UPSD323X bảng dữ liệu(HTML) 49 Page - STMicroelectronics

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µPSD323X
OSCILLATOR
The oscillator circuit of the
µPSD323X Devices is
a single stage inverting amplifier in a Pierce oscil-
lator 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
µPSD323X 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
µPSD323X Devices.
s
Via the external RESET pin
s
Via the internal LVR Block.
s
Via USB bus reset signaling.
s
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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