参数资料
型号: MC9S12C32PMFU16
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: 58/116页
文件大小: 1882K
代理商: MC9S12C32PMFU16
Device User Guide — 9S12C32DGV1/D V01.14
2.3.6 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. PA[7:1] pins are not available in the 48 package
version. PA[7:3] are not available in the 52 pin package version.
2.3.7 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. PB[7:5] and PB[3:0] pins are not available in the
48 nor 52 pin package version.
2.3.8 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 thispin 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 2-5 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
.Please contact the crystal manufacturer for crystal DC
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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