參數(shù)資料
型號(hào): 9S12KT256DGV1
英文描述: MC9S12KT256 Device User Guide
中文描述: MC9S12KT256設(shè)備用戶指南
文件頁數(shù): 60/126頁
文件大?。?/td> 7307K
代理商: 9S12KT256DGV1
Device User Guide — 9S12KT256DGV1/D V01.09
60
Freescale Semiconductor
NOTE:
All VSS pins must be connected together in the application. Because fast signal
transitions place high, short-duration current demands on the power supply, use
bypass capacitors with high-frequency characteristics and place them as close to
the MCU as possible. Bypass requirements depend on MCU pin load.
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
An active low bidirectional control signal, it acts as an input to initialize the MCU to a known start-up
state, and an output when an internal MCU function causes a reset.
2.3.3 TEST — Test Pin
This input only pin is reserved for test.
NOTE:
The TEST pin must be tied to VSS in all applications.
2.3.4 VREGEN — Voltage Regulator Enable Pin
This input only pin enables or disables the on-chip voltage regulator.
VDDPLL
2.5 V
Provides operating voltage and ground for the Phased-Locked Loop.
This allows the supply voltage to the PLL to be bypassed
independently. Internal power and ground generated by internal
regulator.
VSSPLL
0 V
Mnemonic
Nominal
Voltage
Description
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