參數(shù)資料
型號: MC9S12C32VFU25
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 90/136頁
文件大小: 2022K
代理商: MC9S12C32VFU25
Device User Guide — 9S12C128DGV1/D V01.05
57
2.3 Detailed Signal Descriptions
2.3.1 EXTAL, XTAL — Oscillator Pins
EXTAL and XTAL are the crystal driver and external clock pins. On reset all the device clocks are derived
from the EXTAL input frequency. XTAL is the crystal output.
2.3.2 RESET — External Reset Pin
RESET is an active low bidirectional control signal that acts as an input to initialize the MCU to a known
start-up state. It also acts as an open-drain output to indicate that an internal failure has been detected in
either the clock monitor or COP watchdog circuit. External circuitry connected to the RESET pin should
not include a large capacitance that would interfere with the ability of this signal to rise to a valid logic one
within 32 ECLK cycles after the low drive is released. Upon detection of any reset, an internal circuit
drives the RESET pin low and a clocked reset sequence controls when the MCU can begin normal
processing.
2.3.3 TEST / VPP — Test Pin
This pin is reserved for test and must be tied to VSS in all applications.
2.3.4 XFC — PLL Loop Filter Pin
Dedicated pin used to create the PLL loop filter. See CRG BUG for more detailed information.PLL loop
filter. Please ask your Motorola representative for the interactive application note to compute PLL loop
filter elements. Any current leakage on this pin must be avoided.
Figure 2-4 PLL Loop Filter Connections
MCU
XFC
R0
CS
CP
VDDPLL
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