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參數資料
| 型號： | 9S12B128DGV1 |
| 英文描述： | 9S12B128 Device Guide |
| 中文描述： | 9S12B128設備指南 |
| 文件頁數： | 53/128頁 |
| 文件大?。?/td> | 1823K |
| 代理商： | 9S12B128DGV1 |
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Device User Guide —9S12B128DGV1/D V01.11
53
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
(lowpower)oscillatorisusedorwhetherPierceoscillator/externalclockcircuitryisused.Thestateofthis
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
C
2
EXTAL
XTAL
Crystal or
ceramic resonator
VSSPLL
C
1
C
DC
*
* 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
bias conditions and recommended capacitor value C
DC
.
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相關代理商/技術參數 |
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| 9S12C128DGV1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MC9S12C Family Device User Guide |
| 9S12D32DGV1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:9S12DGDJ64DGV1 Device Guide. also covers 9S12D64. 9S12A64. 9S12D32. and 9S12A32 devices |
| 9S12DJ64DGV1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:9S12DJ64DG Device Guide. also covers 9S12D64. 9S12A64. 9S12D32 and 9S12A32 devices |
| 9S12DP256BDGV1 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Automotive applications |
| 9S12DP256BDGV2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:9S12Dx256B Device Guide. also covers C derivatives and 9S12Ax256 devices |
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