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參數(shù)資料
| 型號(hào)： | MC68C912B32FU8 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-Bit Microcontroller |
| 中文描述： | 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | QFP-80 |
| 文件頁(yè)數(shù)： | 11/128頁(yè) |
| 文件大小： | 748K |
| 代理商： | MC68C912B32FU8 |
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MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
11
3.3 Signal Descriptions
3.3.1 Crystal Driver and External Clock Input (XTAL, EXTAL)
These pins provide the interface for either a crystal or a CMOS compatible clock to control the internal
clock generator circuitry. Out of reset the frequency applied to EXTAL is twice the desired E-clock rate.
All the device clocks are derived from the EXTAL input frequency.
Figure 4 Common Crystal Connections
Figure 5 External Oscillator Connections
XTAL is the crystal output. The XTAL pin must be left unterminated when an external CMOS compatible
clock input is connected to the EXTAL pin. The XTAL output is normally intended to drive only a crystal.
The XTAL output can be buffered with a high-impedance buffer to drive the EXTAL input of another de-
vice.
In all cases take extra care in the circuit board layout around the oscillator pins. Load capacitances
shown in the oscillator circuits include all stray layout capacitances. Refer to
Figure 4
and
Figure 5
for
diagrams of oscillator circuits.
3.3.2 E-Clock Output (ECLK)
ECLK is the output connection for the internal bus clock and is used to demultiplex the address and data
and is used as a timing reference. ECLK frequency is equal to 1/2 the crystal frequency out of reset. E-
clock output can be turned off in single-chip modes to reduce the effects of RFI. In special peripheral
mode the E clock is an input to the MCU. All clocks, including the E-clock, are halted when the MCU is
in STOP mode. It is possible to configure the MCU to interface to slow external memory. ECLK can be
stretched for such accesses.
10 M
MCU
C
C
EXTAL
XTAL
2 x E
CRYSTAL
COMMON XTAL CONN
NC
MCU
EXTAL
XTAL
2 x E
CMOS-COMPATIBLE
EXTERNAL OSCILLATOR
EXT EXTAL CONN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68CK16Z1 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series |
| MC68CK16Z1CAG16 | 功能描述:16位微控制器 - MCU 16BIT 1KRAM 32KHZ CRYSTAL RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
| MC68CK16Z1CAG16 | 制造商:Freescale Semiconductor 功能描述:Microcontroller |
| MC68CK16Z1CFC16 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series |
| MC68CK16Z1CPV16 | 功能描述:16位微控制器 - MCU 16 Bit 16MHz RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
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