参数资料
型号: MC9S12DG256MFU
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封装: QFP-80
文件页数: 85/132页
文件大小: 782K
代理商: MC9S12DG256MFU
MC9S12DT256 Device User Guide — V03.07
56
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.
PP4
KWP4
PWM4
MISO2
VDDX
PERP/
PPSP
Disabled
Port P I/O, Interrupt, Channel 4 of
PWM, MISO2 of SPI2
PP3
KWP3
PWM3
SS1
VDDX
PERP/
PPSP
Disabled
Port P I/O, Interrupt, Channel 3 of
PWM, SS of SPI1
PP2
KWP2
PWM2
SCK1
VDDX
PERP/
PPSP
Disabled
Port P I/O, Interrupt, Channel 2 of
PWM, SCK of SPI1
PP1
KWP1
PWM1
MOSI1
VDDX
PERP/
PPSP
Disabled
Port P I/O, Interrupt, Channel 1 of
PWM, MOSI of SPI1
PP0
KWP0
PWM0
MISO1
VDDX
PERP/
PPSP
Disabled
Port P I/O, Interrupt, Channel 0 of
PWM, MISO2 of SPI1
PS7
SS0
VDDX
PERS/
PPSS
Up
Port S I/O, SS of SPI0
PS6
SCK0
VDDX
PERS/
PPSS
Up
Port S I/O, SCK of SPI0
PS5
MOSI0
VDDX
PERS/
PPSS
Up
Port S I/O, MOSI of SPI0
PS4
MISO0
———
VDDX
PERS/
PPSS
Up
Port S I/O, MISO of SPI0
PS3
TXD1
VDDX
PERS/
PPSS
Up
Port S I/O, TXD of SCI1
PS2
RXD1
VDDX
PERS/
PPSS
Up
Port S I/O, RXD of SCI1
PS1
TXD0
VDDX
PERS/
PPSS
Up
Port S I/O, TXD of SCI0
PS0
RXD0
VDDX
PERS/
PPSS
Up
Port S I/O, RXD of SCI0
PT[7:0]
IOC[7:0]
VDDX
PERT/
PPST
Disabled
Port T I/O, Timer channels
Pin Name
Funct. 1
Pin Name
Funct. 2
Pin Name
Funct. 3
Pin Name
Funct. 4
Pin Name
Funct. 5
Power
Supply
Internal Pull
Resistor
Description
CTRL
Reset
State
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