参数资料
型号: UPSD3233A-40T1T
厂商: 意法半导体
英文描述: Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
中文描述: 闪存可编程系统设备与8032微控制器核心和64Kbit SRAM的
文件页数: 49/176页
文件大小: 1081K
代理商: UPSD3233A-40T1T
49/176
μ
PSD323X
OSCILLATOR
The oscillator circuit of the
μ
PSD323X 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 highgain amplifier input, and XTAL2
is the output. To drive the
μ
PSD323X 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
μ
PSD323X 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 Figure20.
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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