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参数资料
| 型号： | MC9SA256BCFUR2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | QFP-80 |
| 文件页数： | 57/102页 |
| 文件大小： | 1050K |
| 代理商： | MC9SA256BCFUR2 |
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MC9S12A256 Device Guide — V01.01
58
A.1.2 Power Supply
The MC9S12A256 utilizes several pins to supply power to the I/O ports, A/D converter, oscillator and PLL
as well as the digital core.
The VDDA, VSSA pair supplies the A/D converter and the resistor ladder of the internal voltage regulator.
The VDDX, VSSX, VDDR, and VSSR pairs supply the I/O pins, VDDR supplies also the internal voltage
regulator.
VDD1, VSS1, VDD2, and VSS2 are the supply pins for the digital logic, VDDPLL, VSSPLL supply the
oscillator and the PLL.
VSS1 and VSS2 are internally connected by metal.
VDDA, VDDX, VDDR as well as VSSA, VSSX, VSSR are connected by anti-parallel diodes for ESD
protection.
NOTE:
In the following context VDD5 is used for either VDDA, VDDR, and VDDX; VSS5 is
used for either VSSA, VSSR, and VSSX unless otherwise noted.
IDD5 denotes the sum of the currents flowing into the VDDA, VDDX and VDDR pins.
VDD is used for VDD1, VDD2, and VDDPLL, VSS is used for VSS1, VSS2, and VSSPLL.
IDD is used for the sum of the currents flowing into VDD1 and VDD2.
A.1.3 Pins
There are four groups of functional pins.
A.1.3.1 5V I/O pins
Those I/O pins have a nominal level of 5V. This class of pins is comprised of all port I/O pins, the analog
inputs, BKGD and the RESET pins.The internal structure of all those pins is identical, however some of
the functionality may be disabled. E.g. for the analog inputs the output drivers, pull-up and pull-down
resistors are disabled permanently.
A.1.3.2 Analog Reference
This group is made up by the VRH and VRL pins.
A.1.3.3 Oscillator
The pins XFC, EXTAL, XTAL dedicated to the oscillator have a nominal 2.5V level. They are supplied
by VDDPLL.
A.1.3.4 TEST
This pin is used for production testing only.
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