参数资料
型号: MC9S12B128CFU16
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP80
封装: PLASTIC, QFP-80
文件页数: 84/132页
文件大小: 1842K
代理商: MC9S12B128CFU16
Device User Guide —9S12B128DGV1/D V01.13
55
2.2.8 PA[7:0] / ADDR[15:8] / DATA[15:8] — Port A I/O Pins
PA7-PA0 are general purpose input or output pins. In MCU expanded modes of operation, these pins are
used for the multiplexed external address and data bus.
2.2.9 PB[7:0] / ADDR[7:0] / DATA[7:0] — Port B I/O Pins
PB7-PB0 are general purpose input or output pins. In MCU expanded modes of operation, these pins are
used for the multiplexed external address and data bus.
2.2.10 PE7 / NOACC / XCLKS — Port E I/O Pin 7
PE7 is a general purpose input or output pin. During MCU expanded modes of operation, the NOACC
signal, when enabled, is used to indicate that the current bus cycle is an unused or “free” cycle. This signal
will assert when the CPU is not using the bus.
The XCLKS is an input signal which controls whether a crystal in combination with the internal Colpitts
(low power) oscillator is used or whether Pierce oscillator/external clock circuitry is used. The state of this
pin is latched at the rising edge of RESET. If the input is a logic low the EXTAL pin is configured for an
external clock drive or a Pierce Oscillator. If input is a logic high a Colpitts oscillator circuit is configured
on EXTAL and XTAL. Since this pin is an input with a pull-up device during reset, if the pin is left
floating, the default configuration is a Colpitts oscillator circuit on EXTAL and XTAL.
Figure 2-4 Colpitts Oscillator Connections (PE7=1)
MCU
C2
EXTAL
XTAL
Crystal or
VSSPLL
ceramic resonator
C1
CDC *
* Due to the nature of a translated ground Colpitts oscillator a
DC voltage bias is applied to the crystal
bias conditions and recommended capacitor value CDC.
Please contact the crystal manufacturer for crystal DC
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